Malicious PDF — malware analysis report

Static analysis result for SHA-256 621cfd12db9afafb…

MALICIOUS

PDF

67.3 KB Created: 2021-01-13 03:42:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9b0e120b99dd4ec36bdd045d135a3180 SHA-1: 4b3903c21c105926eea6f98dec8c3d09ea8e4f44 SHA-256: 621cfd12db9afafbdc4f74a89f4db3f18ab3e718fb44022446ab9876c827f85a
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://trafffe.ru/aws?utm_term=the+beatles+full+album++free PDF link annotation
    • https://site-1168276.mozfiles.com/files/1168276/seven_dead_motorcycle_accident.pdfIn PDF document text
    • https://cdn.sqhk.co/pilupenemima/iaMjh3p/townsmen_premium_paid_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/fojupigek/jTRjf0L/buvikizan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408865/normal_5f94ea56d7a65.pdfIn PDF document text
    • https://cdn.sqhk.co/gukawaki/gShejc7/bus_driver_simulator_game_unblocked.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470977/normal_5feee22d90b00.pdfIn PDF document text
    • https://tatabakag.weebly.com/uploads/1/3/4/8/134885094/jorole.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495841/normal_5fed9b0a34061.pdfIn PDF document text
    • https://site-1172679.mozfiles.com/files/1172679/text_bubble_stickers_iphone.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444882/normal_5fddb1dfd88f4.pdfIn PDF document text
    • https://site-1166601.mozfiles.com/files/1166601/nfl_week_12_predictions_bleacher_report.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/bagisi/lacrimosa_piano_sheet_music.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_off0000cc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5A 5096 bytes
SHA-256: 01bc8249542924f3dd84e41523364b4188420a95015becdfff04ab1d7996f80c
font_01_sfnt_off0000dd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD81 10180 bytes
SHA-256: 597c5e2625926b8cebad452e9aa61582231167a35320a8d906c4255ab2c5590c

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