Malicious PDF — malware analysis report

Static analysis result for SHA-256 105375daabd0352e…

MALICIOUS

PDF

74.1 KB Created: 2021-03-10 20:56:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a5e2295a33e2431b035eda3b62e3a3e7 SHA-1: e30b13e6248424932bf8a84a9a004a5233e9791e SHA-256: 105375daabd0352e7ae4e2c80817bb778dd7e689902c9dd7ae830d098d517f26
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mezovuduw.ru/strik?utm_term=twilight+2008+full+movie+in+hindi+free+download PDF link annotation
    • http://itasummer.fun/steins_gate_0_episode_7_reddit0jwm6.pdfIn PDF document text
    • https://wituxilozixataw.weebly.com/uploads/1/3/5/3/135317309/patazomexumo.pdfIn PDF document text
    • http://instacopyrighthelpteam.com/60673629780zmpz2.pdfIn PDF document text
    • http://fruit-italy.space/xovivovodumotexoxanbyxku.pdfIn PDF document text
    • http://mydenverneighborhoods.com/3217259216cdy0k.pdfIn PDF document text
    • https://jutokikifugata.weebly.com/uploads/1/3/1/0/131070124/fefukida.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377663/normal_600f8e354b1cc.pdfIn PDF document text
    • https://gonuvogizup.weebly.com/uploads/1/3/1/8/131857562/a68a64a613f21c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387810/normal_6041979a9a574.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366357/normal_5fdcaee09553f.pdfIn PDF document text
    • https://kimiragijasem.weebly.com/uploads/1/3/4/0/134096233/602d1ef49a2a7.pdfIn PDF document text
    • https://viwosexoteb.weebly.com/uploads/1/3/4/6/134631328/3545483.pdfIn PDF document text
    • https://xewixubigikuj.weebly.com/uploads/1/3/4/8/134892453/c7276.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vegiziguso.rf.gd/dark_souls_3_boss_tier_list.pdfIn PDF document text
    • https://71f68c9c-1037-483c-a0ca-f268b7ddd3c8.filesusr.com/ugd/87fdc7_e400f5468e5d430e9ca2109bcfb51e18.pdf?index=trueIn PDF document text
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_cea2d45f30fc4819a95054b959ab8183.pdf?index=trueIn PDF document text
    • http://keguwaburafokul.epizy.com/61138339314.pdfIn PDF document text
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_9b655ed9d5f54d7e89083171c95a05f2.pdf?index=trueIn PDF document text
    • http://givugiv.epizy.com/english_grammar_book_for_competitive_exam.pdfIn PDF document text
    • https://ebbb41b5-b8b7-4bfc-9e1b-23e79ad93844.filesusr.com/ugd/5eba67_9769a9c117a34bcb8798ddf9f5ea01b5.pdf?index=trueIn PDF document text
    • https://0443db59-9f9d-4031-b786-8a5723798135.filesusr.com/ugd/ab62d6_e1c65493a8364378ad9825946c25d825.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_off0000e419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE419 5712 bytes
SHA-256: 5f24c3d6cba3475844e219082e7e109139c7d399b3dc1d23a14da69c0851fe74
font_01_sfnt_off0000f777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF777 10268 bytes
SHA-256: 563c6cc26af4b4ac8bc96802391a6be7a9871b12c9e27fb6728e5580df6bf2a8