Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc84c4355d81e27…

MALICIOUS

PDF

73.2 KB Created: 2021-03-03 22:59:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 30085af8fd0dbfc2722a8900621e3ab4 SHA-1: 1cbf1037d770fd079e8c9b75c1acfbe7538aec4f SHA-256: 7fc84c4355d81e27ad783f476309a702f73ad5fe6e8d96afd4a5d42d83579af6
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://fokemale.ru/123?utm_term=icom+706mkiig+price PDF link annotation
    • https://nunofisodopuw.weebly.com/uploads/1/3/4/2/134234763/6e5745d3b96e03.pdfIn PDF document text
    • https://loniforuwo.weebly.com/uploads/1/3/4/9/134904684/1614426.pdfIn PDF document text
    • https://pevufebulole.weebly.com/uploads/1/3/4/3/134351465/modelogazol_sitajogozuxe_bunosagetedela.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413718/normal_5ff552147515b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413575/normal_6026c36cc7cba.pdfIn PDF document text
    • https://zajebujop.weebly.com/uploads/1/3/4/9/134902249/6286293.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409627/normal_603b3c97a49c1.pdfIn PDF document text
    • https://pawomasa.weebly.com/uploads/1/3/4/7/134737305/gegavibumasigup.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/nolarifaforuxop/page-_break-_inside_mpdf_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/mulifa.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/install_small_chrome_extension.pdfIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/assassin_s_creed_identity_rexdl.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_off0000df66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF66 5208 bytes
SHA-256: 99a947d8a7a643f5b1f16aa191d9a94aeb281f4312ae7ec4dc6a294c36a7b3cf
font_01_sfnt_off0000f124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF124 11096 bytes
SHA-256: e6d17513386fcf08c6548c384f8f32fdeb9561663354a611620342f1c4b84d45

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