Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa871089d5adfdc2…

MALICIOUS

PDF

60.5 KB Created: 2021-01-13 05:10:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: bcb078e830e8288f8d9e5a853254eccd SHA-1: 8c206ec13ab2350a7da4024f006bc9e807ae8ec7 SHA-256: aa871089d5adfdc2e2e6f40838fd90b75c140881c4f0126e8da4c709600725dc
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains multiple external URLs, including one pointing to 'traffnew.ru', which are likely used to redirect users to malicious sites. The PDF's structure and embedded links suggest it functions as a link farm, a common tactic for distributing malware or conducting phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffnew.ru/123?utm_term=star+wars+republic+gunship+lego+instructions PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4462066/normal_5fe509f049077.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388614/normal_5fc42b3b6b921.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394073/normal_5fbddac88b495.pdfIn PDF document text
    • https://dutedurelixuvu.weebly.com/uploads/1/3/4/3/134320021/garatologet-xututixopisi-minesedigave.pdfIn PDF document text
    • https://siravexadobema.weebly.com/uploads/1/3/4/3/134320718/1fbb41c152651.pdfIn PDF document text
    • https://site-1177842.mozfiles.com/files/1177842/plan_electrique_maison_100m2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473892/normal_5fc44da33512f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419433/normal_5fa0fcf039e1f.pdfIn PDF document text
    • https://site-1178069.mozfiles.com/files/1178069/baldi_s_basics_classic_mod_menu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376599/normal_5f97ace299a57.pdfIn PDF document text
    • https://luzodogapop.weebly.com/uploads/1/3/4/2/134265842/deafb.pdfIn PDF document text
    • https://site-1180408.mozfiles.com/files/1180408/racing_manager_2014_review.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ad94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD94 5532 bytes
SHA-256: ee318d54eea58133e9ec0dcd9415a96ed5f2e81da4050f7fdb1bf91aea91253c
font_01_sfnt_off0000c069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC069 11004 bytes
SHA-256: 9e1039ae7cf6cd6c8118d7ce1bed80902234fab714204ea88c41afda36159bbd

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