Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6b71f3c2ef53ecc…

MALICIOUS

PDF

103.6 KB Created: 2021-09-10 08:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: 4a95c8d422562956209b36a0c5742d23 SHA-1: 9bee240f34aca17bb2df2a74290974ebdcc8f424 SHA-256: a6b71f3c2ef53ecc41d09aec542c5dfe006b42f7857eff93f7ee518dec4eaab9
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://synerhu.ru/uplcv?utm_term=greek+words+starting+with+k PDF link annotation
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631248460_842496a5c4.pdfIn PDF document text
    • https://xinpayflow.com/ckfinder/userfiles/files/gimepus.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/xunut.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/limatejonujanus.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139e7f153d79---74027090866.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/zunawufo.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/vuwudukubowekuvulirebetit.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/80806891593.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/48573307158.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/92486862191.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/vipofubefudutajuk.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/62558102848.pdfIn PDF document text
    • http://polletnv.be/uploads/files/zisufigebesufa.pdfIn PDF document text
    • https://citytrafik.nu/images/file/63362722821.pdfIn PDF document text
    • http://rsst77.ru/upload/files/vapaf.pdfIn PDF document text
    • http://meta-min.com/files/xiranesuwilezoze.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/77974550630.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/filevosidemelewopumir.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/3613622592.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/68505088445.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/65202432951.pdfIn PDF document text
    • http://186086.com/upload/files/wozuwuxoradabevidenate.pdfIn PDF document text
    • http://lejuriste.ru/files/file/vikenefogometopelisu.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001213c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213C 24528 bytes
SHA-256: ab3f91f97e150fc37ed4efba250043da5ab5bc8a88bc10e0e4589354ecf2f823
font_01_sfnt_off00016053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16053 10700 bytes
SHA-256: e31e623e2f49413793cbac6bcde10017f1f1ade07e6eadf93ac0cf610ee3f137
font_02_sfnt_off000178b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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