Malicious PDF — malware analysis report

Static analysis result for SHA-256 a94b3a51a634fb54…

MALICIOUS

PDF

78.6 KB Created: 2021-02-20 22:01:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 9c08c626b1c65f1870b2d40d2b1b36e0 SHA-1: 2323fb34b8abd172855410b999d46229c57c7790 SHA-256: a94b3a51a634fb5426bef6e3c83c3ca5808738e90a962cc59976ae1d3f6aa025
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://seumenha.ru/123?utm_term=snap+on+3%252F8+torque+wrench+click+type PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465705/normal_6028ee6e21d9d.pdfIn PDF document text
    • https://cdn.sqhk.co/vidikusupegu/DijVMWf/acrylic_nails_pinterest_short.pdfIn PDF document text
    • https://lugigotaxur.weebly.com/uploads/1/3/0/9/130969655/mojalemisilekotutare.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367310/normal_60121923f2ea0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426410/normal_60020083d4186.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497095/normal_602f48ab52017.pdfIn PDF document text
    • https://nisaxiguxizi.weebly.com/uploads/1/3/5/3/135306566/jinebinipoza-dibukujol-tuvuzuwemotuxo-nafawomuzatiru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374853/normal_6029a0688d6b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494868/normal_5ff02ff802e8a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417213/normal_5fff94f330a62.pdfIn PDF document text
    • https://luzuredero.weebly.com/uploads/1/3/4/0/134016924/befojipupupekaxoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448713/normal_602e77a9e7caa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/border_movie_song_bestwap.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/3d_reader_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/ralirenexamasanu.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF044 5724 bytes
SHA-256: c6a28e79babdec42dcf4cc443eef957e2dd9b301a319d454bb20fd1898b8b0a2
font_01_sfnt_off000103e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E1 12396 bytes
SHA-256: 8f69ac5f83925ffb0251da46aad0d7e1dfccce1bd637e034ebfd9a40de4613ad