Malicious PDF — malware analysis report

Static analysis result for SHA-256 13257448f49cb38b…

MALICIOUS

PDF

78.0 KB Created: 2021-04-04 21:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 0d2c1ff34528efa57c5995096816037e SHA-1: 58b5a43c469f61e85bf97c3be93e26457a5c2e50 SHA-256: 13257448f49cb38b3fca47a3bfd4f1060e14992592a3a4b49a566adf892a4f10
186 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a significant number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, contains references to 'job application form pdf', indicating a lure. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the conclusion that this PDF is designed to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/award?keyword=big+w+job+application+form+pdf PDF link annotation
    • http://ewwe.space/lathe_di_chadar_punjabi_songl8pps.pdfIn PDF document text
    • https://vegekonewipure.weebly.com/uploads/1/3/5/9/135964828/2459975.pdfIn PDF document text
    • https://labafapagitef.weebly.com/uploads/1/3/1/6/131637364/47d7391b.pdfIn PDF document text
    • http://idealslimitaly-ufficiale.site/jntua_b._pharmacy_r15_syllabus4c7hq.pdfIn PDF document text
    • https://nizevamil.weebly.com/uploads/1/3/2/8/132814567/88addcdb548.pdfIn PDF document text
    • http://form-lnstagramcopyrightservices.com/8535163842oatwg.pdfIn PDF document text
    • http://sodaapp.pro/917823027953nuzl.pdfIn PDF document text
    • http://draiwenstore.online/samsung_rf267abrs_refrigerator_leaking_waters2jw5.pdfIn PDF document text
    • http://idealica-tufficiale.website/61838100280uu59d.pdfIn PDF document text
    • https://nujetamewude.weebly.com/uploads/1/3/4/8/134881912/4174765.pdfIn PDF document text
    • https://mituzeru.weebly.com/uploads/1/3/2/6/132681412/e2d78c3d077e.pdfIn PDF document text
    • http://foodguideblog.com/xagaxijewodevefemudidaswgr8.pdfIn PDF document text
    • http://liko-sneakers.com/how_much_do_police_ranks_get_paidlauiz.pdfIn PDF document text
    • http://glawerry.online/enemy_within_movie_cast1mjl1.pdfIn PDF document text
    • http://garant-ritual.online/kosanokofenowsy9.pdfIn PDF document text
    • http://salestore.pro/listening_practice_through_dictation_google_drivejiv2t.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e905a76e-7bc1-418c-be29-e8eda1603e86.filesusr.com/ugd/3fb32a_1d950fd9700c423db32725a1ea61ae1a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4caceb55-6914-46dd-a451-fd48753b59fd/hp_laserjet_p2015_information_page.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bf0026d-1fe5-481a-9355-8ded82853be8/if_adam_did_not_sin.pdfIn PDF document text
    • https://6363ce23-9394-4102-a476-7be320345719.filesusr.com/ugd/7c41c1_ff043ae557554581b959bc85b1b5e05b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ce3dbf5-039c-4bf9-8dc2-18211c0a6459/what_is_the_definition_of_thermal_conductivity_in_science.pdfIn PDF document text
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_815c9bea1c1e4c54858fdf91cae08758.pdf?index=trueIn PDF document text
    • https://700ceb37-22d2-47c5-9888-d858af679aee.filesusr.com/ugd/c345b0_be93b14808be4275abcc85dfff722e71.pdf?index=trueIn PDF document text
    • https://184d393c-d2ff-49e5-bbcb-48626b1dbf88.filesusr.com/ugd/49be48_e9dc3839eef642d69c9c181e94d597c1.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF226 5656 bytes
SHA-256: 0dab71c125d1d9fc710a5f132f9f534368e326c6ed72ee5de123d9aebfd16317
font_01_sfnt_off00010568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10568 10420 bytes
SHA-256: b1dd49f5720e4aa306109ad2690f4db7ead340f220117340fbd8683ae2a0ed4c

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