Malicious PDF — malware analysis report

Static analysis result for SHA-256 d79fd7e1aab998dd…

MALICIOUS

PDF

74.1 KB Created: 2021-03-03 08:57:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6dbd9918e33f229d82e110d4090ffcf2 SHA-1: d7f87547fbe85be22cb9051dec8765d948c596e9 SHA-256: d79fd7e1aab998dd0c05358f32931334384193c1e7eb4ef97724d4cbbccca31d
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. The PDF contains a large number of external links, many pointing to other PDF files, suggesting a link farm or content distribution mechanism. While no scripts were explicitly extracted, the PDF structure and the presence of external links indicate an attempt to redirect the user to potentially malicious content, aligning with phishing or content manipulation tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/123?utm_term=happy+endings+margaret+atwood+essay
    • https://cdn-cms.f-static.net/uploads/4370780/normal_601cf0fd09c3c.pdf
    • http://fakurivevid.scienceontheweb.net/eso_night_mothers_gaze_crafting_location.pdf
    • https://cdn-cms.f-static.net/uploads/4390681/normal_6016b6c5c866d.pdf
    • https://cdn-cms.f-static.net/uploads/4414672/normal_5fe6d74b71514.pdf
    • https://cdn-cms.f-static.net/uploads/4491175/normal_6011ae5f55191.pdf
    • http://tixokapine.mypressonline.com/zarebixidibiwu.pdf
    • https://fitadidexedas.weebly.com/uploads/1/3/5/9/135977916/feramu.pdf
    • https://static.s123-cdn-static.com/uploads/4369779/normal_5ff58f3e29859.pdf
    • https://cdn-cms.f-static.net/uploads/4412195/normal_5fdbe2fb23c4c.pdf
    • http://rumurel.mywebcommunity.org/how_to_silence_first_alert_smoke_and_carbon_monoxide_alarm.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/boduxatavepe/attack_on_titan_characters_names_all.pdf
    • https://s3.amazonaws.com/dakebesuvum/92311596006.pdf
    • http://wokarodefi.onlinewebshop.net/how_nandini_died_in_ponniyin_selvan.pdf
    • http://sipanokule.onlinewebshop.net/tenuzomajopafulazes.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e715.bin
6c8ae3f674e0f0180f5eea6e6e15f0df59c9115349f5bce68ddf122245c33d90
pdf-font-stream PDF embedded font (sfnt) at offset 0xE715 5400 bytes
font_01_sfnt_off0000f975.bin
88031114c2a653407bbdc96dc3c24cca8f0c2ae8049625162820fa4a8864bbf8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF975 10012 bytes