Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb090f82a45fb3f…

MALICIOUS

PDF

88.8 KB Created: 2021-03-04 17:20:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b757bacf3837e3fd8ff37ff990708b28 SHA-1: 10c9598eca2353dcac3cb95f09e500821103afd2 SHA-256: efb090f82a45fb3f4e85d27cfbf8ffd9404b96cf16f67c997185480ede37aab8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9996

Heuristics 5

  • 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 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://jottigo.ru/award?keyword=is+simply+wall+street+legit PDF link annotation
    • http://idealica-it.website/melaxepidafetewa9iqu6.pdfIn PDF document text
    • http://bestpriceforukraine.xyz/41770917996t7ilc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415073/normal_5fdcbfc76a350.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483081/normal_5fe1544f25418.pdfIn PDF document text
    • http://help-igcopyright.xyz/vekarivezujivitavuxijokuj893b.pdfIn PDF document text
    • http://virnet77.ru/81408659985i5h5k.pdfIn PDF document text
    • http://lnstagramverifycentre.com/fokirojivon7uo44.pdfIn PDF document text
    • http://copyrightsupportforlnstagram.com/63101970701whbf3.pdfIn PDF document text
    • http://mini-cam1.club/871778537705hyc5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374851/normal_6000153debc9f.pdfIn PDF document text
    • http://health-top.ru/my_lips_are_constantly_dry_and_cracked6ltna.pdfIn PDF document text
    • http://help-feedback-amzn6.xyz/creo_parametric_drawing_tutorialcbias.pdfIn PDF document text
    • http://krym.today/ielts_certificate2tk7c.pdfIn PDF document text
    • http://macsk.space/basic_electronics_free_in_telugurs58c.pdfIn PDF document text
    • http://organicsss.space/thermo_king_alarm_codes_102y4bn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390069/normal_600c0b2a318ef.pdfIn PDF document text
    • http://clubstore.info/list_of_core_values_for_studentskzm1x.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_3e3d4bc43a6a4b419a810a111f33576e.pdf?index=trueIn PDF document text
    • https://050a9d39-d8a1-4107-8be8-b2b70b72e454.filesusr.com/ugd/5262df_77d1655f886442328e03545a86c3180e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/863fbb95-bf8b-4a86-aea6-d25392162853/annie_dillard_pilgrim_at_tinker_creek_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b66e6c2-098f-4b7a-b61f-75ebd773f582/nlp_introduction_ppt.pdfIn PDF document text
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_d41bf5487ad0411f9a6d8b369d41200c.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_off00011ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED0 5268 bytes
SHA-256: 7419f617274385aaad4afef376d9ccd3125f6b37c8b756b429379f0ad7ddfd73
font_01_sfnt_off000130bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130BB 10952 bytes
SHA-256: bb45f48ee850a16ebf9a3bd35c410c50cab832ea07b5cf8b61b3d96fb680fe82

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