Malicious PDF — malware analysis report

Static analysis result for SHA-256 393fd6ecbf8b444e…

MALICIOUS

PDF

101.7 KB Created: 2021-03-29 08:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 60703a39711c289d11cf005b5fd105b5 SHA-1: 54aa7bf58d5456cec4d9811bb3a0de04434d2e49 SHA-256: 393fd6ecbf8b444e8fe3ed4f98d3cbefd78831a1613115e7be0587a27fcb5b7c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it's part of a link farm designed to redirect users to potentially malicious content. The embedded URLs and the heuristic firings point towards a phishing or SEO spam attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://seumenha.ru/strik?utm_term=what+is+the+binomial+probability+formula+mean PDF link annotation
    • https://binazinir.weebly.com/uploads/1/3/4/1/134108718/vonam.pdfIn PDF document text
    • http://spain50off.info/fire_and_ice_the_dragon_chronicles_full_movie_in_hindi_480pc98uk.pdfIn PDF document text
    • https://kusotabemeradu.weebly.com/uploads/1/3/4/8/134873971/a7650b5566.pdfIn PDF document text
    • https://mowexenasa.weebly.com/uploads/1/3/2/8/132815879/6231863.pdfIn PDF document text
    • https://poxatekegevu.weebly.com/uploads/1/3/4/7/134753674/15189ed8c4a59.pdfIn PDF document text
    • https://zufavaxevonek.weebly.com/uploads/1/3/0/9/130969036/nikajusezema.pdfIn PDF document text
    • http://organicnu.info/penidejawu9ksem.pdfIn PDF document text
    • http://tehnotop.space/join_files_side_by_sideb9syb.pdfIn PDF document text
    • https://levapexufusetij.weebly.com/uploads/1/3/4/9/134904519/387839ab368.pdfIn PDF document text
    • https://mutabezikubi.weebly.com/uploads/1/3/4/7/134739743/mipadol-labonuf.pdfIn PDF document text
    • http://copyright-security-ig.com/books_for_8-9_year_olds_ukev7k6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_05a493b480f04a349c66564da3b9bcb2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e742ac78-a9d8-4a3c-b766-26b244b86eb8/norton_anthology_of_theory_and_criticism_2nd_edition.pdfIn PDF document text
    • https://45ed8376-e832-497f-ab20-0a31924dc5db.filesusr.com/ugd/4b7290_bc1ce484f3934711b0078e041dfb7ac7.pdf?index=trueIn PDF document text
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_1573e11684244ca1871c77a489bf5c4d.pdf?index=trueIn PDF document text
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_8a003ca87a9443eebdbb4f23ab5010e7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/efcbda26-22f3-4c5d-b717-d0f3760712d0/what_size_battery_for_walgreens_thermometer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d6487f1-5676-49a4-a552-0cbde2f7da4c/punagupelozidajisomewawa.pdfIn PDF document text
    • https://43fe4710-460a-4ad3-90dc-2dd795c51528.filesusr.com/ugd/a32c20_a32e9196b56242a5b475417ee7bf6929.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/86f41078-65da-406e-a884-c86c3c86c423/85354625379.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5d82955-bd98-439f-99a1-245bd5a1a9e4/cual_es_el_proceso_de_investigacion_cuantitativa.pdfIn PDF document text
    • https://70848fb0-0fd0-490a-9360-2ffa38fc212c.filesusr.com/ugd/08e331_d5c135e23485406ab7ceae4f3375065c.pdf?index=trueIn PDF document text
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_22f179ea382c45f7809e5a49545b5c74.pdf?index=trueIn PDF document text
    • https://b2f02272-107b-4032-aafc-54cdd6265a16.filesusr.com/ugd/6cf392_b513a9f737b34c6f82366ac7cc1a3a69.pdf?index=trueIn PDF document text
    • https://0f285ee0-1b14-49a2-8a3e-060a2db94812.filesusr.com/ugd/4bf67f_a3ebee2cd5e644db9b953b0193d30274.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000130ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130EA 5396 bytes
SHA-256: db6f69d8429cf8813071d14387bc90d48959b9f5d5287dd91f4aae23929789aa
font_01_sfnt_off00014329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14329 14272 bytes
SHA-256: 2341568d81254e2a2f0ad6b97f2ad7f26cc95ec850a9f75fe9e4c58775e797bd
font_02_sfnt_off00017273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17273 16368 bytes
SHA-256: 402325fb7326dd3791c6f1e211419b07cc67f9ec33a01a23974035335d04ee20

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