Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae51d81880b6e057…

MALICIOUS

PDF

99.0 KB Created: 2021-03-18 03:33:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c5301785a1953ca28deebd10828d8075 SHA-1: bb1d388ef5fe122ca5be4b7bd96972b80e656abb SHA-256: ae51d81880b6e057da6bc12c5ddd0b1969b589b96e19b3955415186141328ae5
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicative of a link farm designed to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/award?keyword=zainab+al+ghazali+books+pdf PDF link annotation
    • http://verifybadgehelp.com/how_many_jojo_parts_have_been_animatedfl34e.pdfIn PDF document text
    • http://fishland.store/customer_feedback_survey_template_wordt5v95.pdfIn PDF document text
    • http://interplast.ru/9640816417kenkj.pdfIn PDF document text
    • http://contact-git.top/45371939525i1d5q.pdfIn PDF document text
    • http://xutefizil.getenjoyment.net/apostila_aprender_ingles_sozinho.pdfIn PDF document text
    • https://ruwatavefi.weebly.com/uploads/1/3/4/7/134704280/tegiwub-jonufegejoxexom-pejixenili-depedujodojad.pdfIn PDF document text
    • https://dezazobe.weebly.com/uploads/1/3/4/7/134755526/409d1668a0.pdfIn PDF document text
    • https://fofapisobav.weebly.com/uploads/1/3/4/7/134712410/2490529.pdfIn PDF document text
    • https://dezuximoloxesar.weebly.com/uploads/1/3/1/4/131410685/ginel_jogolumif.pdfIn PDF document text
    • https://ledejikijosud.weebly.com/uploads/1/3/1/6/131607919/8573388.pdfIn PDF document text
    • https://xirabefutabo.weebly.com/uploads/1/3/5/3/135323672/lejudexaziramurigas.pdfIn PDF document text
    • http://im-marceting.site/fanikipug6kid9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cb6d8354-940b-4e05-9f1d-0150973ab277.filesusr.com/ugd/882da0_9095e25a0e3e4c50a1fdcaa31a4e3754.pdf?index=trueIn PDF document text
    • https://65de77fc-0341-4fd2-89b2-cd6b005a91de.filesusr.com/ugd/cf79db_63fd390a6a5844799594546ca2ecf24c.pdf?index=trueIn PDF document text
    • http://kufekisawisewo.onlinewebshop.net/cetonas_en_orina_en_embarazo.pdfIn PDF document text
    • https://5c2df1de-05ea-4e17-9aa3-38adc7ce3153.filesusr.com/ugd/ddd609_88417a13cb604b4f893b07f80061d5c0.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://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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00015a54.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15A54 21580 bytes
SHA-256: a13de572f394a9b0002f28bf063ec186fc310a3c3800174a19fc599c2d474536
font_00_sfnt_off00011eb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB8 5416 bytes
SHA-256: 3e3d234726b68f60fa095942482bcbe5781abfb06aea9439c1dff6f14ae5343d
font_01_sfnt_off00013126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13126 13064 bytes
SHA-256: a6776b2a76bcf82416aff66d8f03ae655b1fec2938dac4fb94afe6e147ecddde

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