Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa1e81fb88a6f7a2…

MALICIOUS

PDF

79.9 KB Created: 2021-01-19 18:58:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: f334bf1263499d915c5950f796d3c2ff SHA-1: 88392a4bb1ed93478cff2b63b14613d29c6c3c60 SHA-256: fa1e81fb88a6f7a2ea1934850d9ffa26d2f8331b7ac305da75536cb1b22acb1a
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though truncated, suggests a lure related to employment contracts, aligning with phishing tactics. The ML classifier and ClamAV detection further support its malicious nature, pointing towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/123?utm_term=non+renewal+of+employment+contract+letter+template In PDF document text
    • https://cdn.sqhk.co/digiwejasipu/gdLfiif/tovoxiwitifalezo.pdfIn PDF document text
    • https://cdn.sqhk.co/mudaxomemut/aKihajd/63701518644.pdfIn PDF document text
    • https://cdn.sqhk.co/zupodejadofe/bV4nshc/crossy_road_gameplay_android.pdfIn PDF document text
    • https://cdn.sqhk.co/jefapukawore/gxmiegg/nbc_sports_gold_premier_league_commentators.pdfIn PDF document text
    • https://site-1171585.mozfiles.com/files/1171585/google_slide_background_templates.pdfIn PDF document text
    • https://site-1168038.mozfiles.com/files/1168038/75866465690.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482215/normal_5fbdbf1f85ced.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365621/normal_5f9ef30490a23.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/ijhj6gj/luna_s_fate_all_gift_code.pdfIn PDF document text
    • https://site-1176633.mozfiles.com/files/1176633/74949171912.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454421/normal_5fea142c64c2c.pdfIn PDF document text
    • https://site-1192787.mozfiles.com/files/1192787/50811458108.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jusudab.epizy.com/49368430547.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/capitulo_4a_4a-1_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/75769198994.pdfIn PDF document text
    • http://tozoxuzev.epizy.com/40344030806.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22F 2828 bytes
SHA-256: 3b89a1333aa93e194de12c5c5da229a8f3a969ace6b07a90c5323b9ece6747ec
font_01_sfnt_off0000fc2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2A 5144 bytes
SHA-256: c70aca0380db1292aa2da851c7458ce8d1cc0a184e021a661399ad0f19e9b102
font_02_sfnt_off00010dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBA 9996 bytes
SHA-256: 4e82905c78a5efbb6194691ada92739bc225c2ab7aec2c63d11596ee17b6fccb

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