Malicious PDF — malware analysis report

Static analysis result for SHA-256 758160d4edcbdf57…

MALICIOUS

PDF

95.8 KB Created: 2021-06-09 16:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7def82dd74cf46739d11a33241864661 SHA-1: 5cbe8b05195bc3741c27402f6e4535342089e56a SHA-256: 758160d4edcbdf577a8d4c4813e0b69c731f619096da0860a89fe654f158a5a0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure strongly indicate a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

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://catamma.ru/pbw?utm_term=beyblade+burst+ep+24 PDF link annotation
    • https://goxepafanaba.weebly.com/uploads/1/3/0/7/130739763/bebefupitaguto-napijufatufedof.pdfIn PDF document text
    • https://kavivafome.weebly.com/uploads/1/3/2/7/132740637/mizixefitufaze.pdfIn PDF document text
    • https://kosopewoxi.weebly.com/uploads/1/3/5/3/135318270/komulevanosuruduxib.pdfIn PDF document text
    • https://wirejosesem.weebly.com/uploads/1/3/1/8/131856641/9470208.pdfIn PDF document text
    • https://vavaxurose.weebly.com/uploads/1/3/0/7/130775274/vanekufa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fcbff9f-01c5-4005-b1ab-21a28c179587/notumewiwata.pdfIn PDF document text
    • http://famukaser.pbworks.com/w/file/fetch/144423780/xerevesigudazegaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50b11515-8d7c-460e-9c13-c17c7547f9de/important_dates_of_the_great_depression.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae9305a6-1cc5-46e0-97c0-ef94f37f3c32/how_do_you_find_r_in_compound_interest.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55977201-b8d1-49ff-bb2c-a404a093fdcf/fapabaxikapikividuxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46011234-89e9-4bcd-a2c2-1ee46b7a8275/dosis_de_aceite_de_organo_para_candidiasis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1bb941a-1419-42ad-953e-00404b9620ef/vanuza.pdfIn PDF document text
    • http://tagexoba.pbworks.com/f/tulawizuji.pdfIn PDF document text
    • http://feteselulo.pbworks.com/w/file/fetch/144789384/how_to_insert_video_in_canvas_discussion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15eac605-b2b8-47b7-9116-c8459762032b/vodize.pdfIn PDF document text
    • http://vugufosenene.pbworks.com/w/file/fetch/144779727/tutuzemuxejinolegizeweti.pdfIn PDF document text
    • http://juvupumanut.pbworks.com/f/ajustar_reacciones_redox_ejercicios_resueltos.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00013bea.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13BEA 29240 bytes
SHA-256: e2a720320fde9feef6a7d5726bbbe2dc83b37f02d536d15e354ef7bc750d47b5
font_00_sfnt_off0000e5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C2 5136 bytes
SHA-256: 4911b1ab519662e9d377be88287fdc3bc3510eceb8cb86e4e0a4bfac814de0cb
font_01_sfnt_off0000f769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF769 5464 bytes
SHA-256: 22619ffba218af233beba78921b54cdef21a9c90acf730c8064a0b7d2821041b
font_02_sfnt_off00010a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0B 2044 bytes
SHA-256: 7819ef1de3348ad227e302ba7a5900f372fd4440a21f482bbf68fb1bc67eb97d
font_03_sfnt_off00011378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11378 12360 bytes
SHA-256: 50942d67632bbfb19fe437f2a2d501e618e70e3f8b99bcdf5d79df3342c05356

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