Malicious PDF — malware analysis report

Static analysis result for SHA-256 91238ec9615b5b7f…

MALICIOUS

PDF

82.4 KB Created: 2021-03-26 05:18:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 55502fe12a6ef336e8e985cd312e4a8b SHA-1: 9e759bef8efc7a47e8059200dd2e9d8b808ec2de SHA-256: 91238ec9615b5b7f4ae03a7350210f4ba42d5d987aaa8e1a8072fdcb3c5ce494
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 0.9997

Heuristics 5

  • 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.
  • 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://xezojetit.ru/aws?utm_term=english+grammar+check+app+for+iphone PDF link annotation
    • http://erogancolumbia.site/fedutafavizodejalifowunuuf8ra.pdfIn PDF document text
    • http://inscarusa.info/76124821442h0h1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389097/normal_600e332532f83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445882/normal_602606ee807c4.pdfIn PDF document text
    • http://fallofelin.online/fibaxunijeeu7a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381094/normal_602be5dc7438c.pdfIn PDF document text
    • http://extra-fon.ru/stihl_bg86_vacuum_kit932mi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411682/normal_603411e358e69.pdfIn PDF document text
    • http://summ-green.fun/vorozuzugabedopisanijodab41aij.pdfIn PDF document text
    • http://italysummer.space/mutimamofotnnq2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423137/normal_604ae119ce177.pdfIn PDF document text
    • http://copyright-central-media.com/85907579968o0roj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405641/normal_6011de1f31b5f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c10fec7-7c80-49f3-a988-d859d4982e76/75004360878.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6021836-785d-491b-a780-e50e1885538f/tajaxukogebarakiromefifa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b28bd4af-e4e8-4010-ac35-21be35a19b03/mous_-_protective_case_for_iphone_11_pro_max_-_limitless_3.0.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba2f554e-1846-4ce1-abca-bdfa4b31f72a/38073496234.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8c23ecd-7459-4a3e-9ae5-5af57811b1d7/bufiputigejaluzizofuti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c558b27-330d-4adc-9325-bb9c2b3adc53/77365347884.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f9b8eae-2915-42cc-a1f1-7ba8950ea7e3/ritofokizepifepadepetaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e5b38b9-b61f-4597-b3fa-ee08563628ef/stihl_bg_86_carburetor_adjustment.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_off00010481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10481 5448 bytes
SHA-256: 29e14a5bda12a206e302174d3d0930872448ef7794c740dd413e763f31e9a6e5
font_01_sfnt_off000116eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EB 11188 bytes
SHA-256: 1d313f004f1a79f4c0b11076f979cdb6372ffc968cd107bd29c898c9e18973d5

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