Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dd1dc8222e9e5a0…

MALICIOUS

PDF

76.8 KB Created: 2021-05-19 05:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c5e5d2a29b313a88e133750297c05bc8 SHA-1: 55087a915ab5d1dd1a56c02abb348a5addd1fb94 SHA-256: 8dd1dc8222e9e5a05eba2df12bdaa0e61129abd0f66a29bcc10f5d87896d9d42
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9998

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
  • 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.
  • 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://baarspo.ru/strik?utm_term=exercices+calcul+litt%25C3%25A9ral+3%25C3%25A8me+brevet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4503033/normal_6064d157a0ece.pdfIn PDF document text
    • https://mebogizudoredo.weebly.com/uploads/1/3/4/4/134472702/9688491.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391599/normal_5fd60fe3b2c90.pdfIn PDF document text
    • https://sivusizawijavoj.weebly.com/uploads/1/3/4/4/134482483/vewosalatex.pdfIn PDF document text
    • https://tuzejaved.weebly.com/uploads/1/3/3/9/133997948/tobavujefi_gibariperowinen_dojapotowelejet.pdfIn PDF document text
    • https://zetizisoxaw.weebly.com/uploads/1/3/4/4/134498522/ade2de049c8da.pdfIn PDF document text
    • https://biparobotimipus.weebly.com/uploads/1/3/4/4/134498468/669269a4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409394/normal_600e7dbdd1226.pdfIn PDF document text
    • https://lolivifi.weebly.com/uploads/1/3/0/7/130739590/9480430.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412181/normal_606b324dc5721.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406775/normal_5fcaf4a4af5ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445888/normal_6027e07ce8309.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475571/normal_5fd37b39690bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471703/normal_60616700c74f8.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/fcbe62b3-4c17-44b0-a289-113d124d64f0/jack_daniels_running_formula_book_download.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/45425889346.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3951bda9-01af-4ee0-a485-3d3164561aee/gofijubukagor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d22cd5b0-0e31-4d56-be02-8ab3ffc45e21/aircraft_maintenance_technician_jobs_in_singapore.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/kamugatuxamabavujufom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98675ccd-f7f6-4b5c-9c70-19a6eb897373/1557597850.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_off0000edb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB6 5620 bytes
SHA-256: 9e9cbb0aeeb56cd8908da98c7c37dabdea2727c5d4af83144170f1f75db78e1d
font_01_sfnt_off0001002e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002E 10776 bytes
SHA-256: 7e3b2176f471da58ee48567595a21a7f12888cf6de263a2f02a1ce5aada3d9e9

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