Malicious PDF — malware analysis report

Static analysis result for SHA-256 678a91308a5ce5cd…

MALICIOUS

PDF

72.8 KB Created: 2021-02-13 17:00:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e6334cbc2bd1379d825a3156a731b197 SHA-1: 198b3281c342bbdb98e06463122e849d6095af44 SHA-256: 678a91308a5ce5cdc39884759e6f432ade62aee1e583af52a2f8f7bf1778f6bd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The document's structure and URL patterns suggest it is designed to trick users into downloading further malicious content, likely by masquerading as a legitimate file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://jacksth.ru/wix?keyword=dominoes+math+worksheet PDF link annotation
    • http://streamsweets.com/philosophical_assumptions_in_researchtpb3g.pdfIn PDF document text
    • http://armada.technology/57482207327oy2zo.pdfIn PDF document text
    • https://burufazifefep.weebly.com/uploads/1/3/4/5/134584298/gotinotofudameki.pdfIn PDF document text
    • http://amsidgi.xyz/bike_racing_game_javay1e5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366017/normal_5fd94b4fb978b.pdfIn PDF document text
    • http://newberginvestmentproperty.com/81469468857j2a7b.pdfIn PDF document text
    • https://jerefukixuludew.weebly.com/uploads/1/3/4/6/134686450/jawiridunav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452381/normal_5ff3886a84778.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386337/normal_600a7ed7520a6.pdfIn PDF document text
    • https://bujivopipagafo.weebly.com/uploads/1/3/5/3/135321681/mibebevo.pdfIn PDF document text
    • http://odebayitrafikhizmeti.com/704000234093ydux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387408/normal_5fe06f7a5695b.pdfIn PDF document text
    • http://show-visitor.xyz/baldi_s_basics_1._3_apkwtmgg.pdfIn PDF document text
    • https://kumupesefutevun.weebly.com/uploads/1/3/4/4/134463509/bd9e8ab0cc1ab88.pdfIn PDF document text
    • http://cmb-societe.com/fimelanotaponanapabevitgf5ln.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427282/normal_6022adb79942d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413117/normal_5fffb9bd68242.pdfIn PDF document text
    • http://titoto.xyz/didikevudutekij7gb1p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408180/normal_6024450fe6e25.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE255 5048 bytes
SHA-256: fc2e0306c602d7001dced43b2a87fcbe2b4e46a3d6720954493baf01eaabbebf
font_01_sfnt_off0000f366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF366 10196 bytes
SHA-256: e529b9e9b9ebbf15b856e7a4754e626566e248acb484de5bbcc64fdc58082252

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