Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a968d13039d3f96…

MALICIOUS

PDF

74.1 KB Created: 2021-03-03 20:09:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 009821cc093e936c18a1d07b7430a41f SHA-1: ce68791ec87da74e686a9d4006d938c8d152d35e SHA-256: 1a968d13039d3f967df0e9a7d045ff66366eb0b7c20b2211abc66f20e52b0ed5
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, with one heuristic identifying it as a link farm on disposable hosting. The document body, though heavily obfuscated, contains keywords related to car maintenance, suggesting a lure for users seeking information, which is then redirected to potentially malicious sites.

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
  • 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://mezovuduw.ru/wb?keyword=how%20much%20is%20honda%20maintenance PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4449998/normal_5feb05135d37e.pdfIn PDF document text
    • http://jokixulu.iblogger.org/guraxaxuzasisoradikujupod.pdfIn PDF document text
    • https://cdn.sqhk.co/vizakifito/phbMgjf/fisher_price_dino_racer_australia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480582/normal_6017b7a71b234.pdfIn PDF document text
    • https://cdn.sqhk.co/bogulevim/cgdHxhc/mabeki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451971/normal_5feb338f29aa6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366639/normal_602fe63e688ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401976/normal_6011e26d311b7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dipijiz.epizy.com/kuxopufufokevusuvebavewi.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/banej.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/surah_e_al_waqiah.pdfIn PDF document text
    • http://vavegigodal.epizy.com/play_store_new_version_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/kavere.pdfIn PDF document text
    • http://mudozegiviw.epizy.com/red_hot_dry_patches_on_face.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_off0000e6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E6 5104 bytes
SHA-256: 7e71a0ff3f238ca93c392ecff197cb8e4ab43fb960896dee9a19066e3af4d7d8
font_01_sfnt_off0000f829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF829 10488 bytes
SHA-256: 91d7ce9f7e2bd81a6762a64f7fe2195e3b73b0beb70f40d98b9d0651d844c00b

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