Malicious PDF — malware analysis report

Static analysis result for SHA-256 840df76867a54cb9…

MALICIOUS

PDF

77.5 KB Created: 2021-04-14 01:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec07898fdcea2b90aaff87b3f2c1fac8 SHA-1: 91146b9f4b7ef0acad6f863f63cc1b08df132104 SHA-256: 840df76867a54cb9b2acec8f430aa1b0d4f2a5107ea7e524f57ee665525facef
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to disposable hosting, and one specific URL `https://jumiwimov.ru/strik?utm_term=the+book+of+life+apology+song+lyrics` which is likely part of a phishing or malware distribution chain. The document body, though heavily obfuscated, suggests a lure related to song lyrics, which is a common tactic for social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jumiwimov.ru/strik?utm_term=the+book+of+life+apology+song+lyrics
    • https://cdn.sqhk.co/vumuwilaj/jaSoihE/rububaxipefune.pdf
    • https://puxodemidumez.weebly.com/uploads/1/3/5/3/135345879/pixilep-wenubaxumi.pdf
    • https://cdn-cms.f-static.net/uploads/4446283/normal_602b7280c7249.pdf
    • https://static.s123-cdn-static.com/uploads/4484612/normal_5ff830a10318c.pdf
    • https://sizegetode.weebly.com/uploads/1/3/4/3/134309939/2685637.pdf
    • https://matatotasewitux.weebly.com/uploads/1/3/1/3/131384286/8070794.pdf
    • https://cdn-cms.f-static.net/uploads/4411714/normal_60688b5fbf3d7.pdf
    • https://cdn-cms.f-static.net/uploads/4475738/normal_603b2f1c787c3.pdf
    • https://cdn.sqhk.co/lasumalena/ichaAim/sijijivederitudulal.pdf
    • https://cdn.sqhk.co/waxobakal/jjbijgc/mind_games_for_free_online.pdf
    • https://bilewemebit.weebly.com/uploads/1/3/5/9/135964156/lexekogufoledija.pdf
    • https://cdn-cms.f-static.net/uploads/4417046/normal_600c6fae53d4a.pdf
    • https://cdn-cms.f-static.net/uploads/4455183/normal_605847df4af06.pdf
    • https://vakugisup.weebly.com/uploads/1/3/0/7/130739558/3e08476f3.pdf
    • https://cdn.sqhk.co/guvevifowo/j3hdgdl/ria_money_transfer_services_pvt_ltd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tanikanaw/93176601554.pdf
    • https://uploads.strikinglycdn.com/files/0879c20e-87be-4b2d-92b2-a708b43c0ddf/como_hacer_un_panel_solar_casero_para_una_maqueta.pdf
    • https://s3.amazonaws.com/fizup/nozaxezuse.pdf
    • https://s3.amazonaws.com/gofiguj/84540230008.pdf
    • https://uploads.strikinglycdn.com/files/ee5db736-a855-43e9-a416-9d709d0ef46b/68374833673.pdf
    • https://uploads.strikinglycdn.com/files/7df1512f-7d70-4a75-8eda-d35f492a0ed8/10375358087.pdf
    • https://uploads.strikinglycdn.com/files/a19847bd-61a0-4918-a288-14fe93ba6a34/accu_chek_compact_plus_glucometer.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_off0000ee4b.bin
e5d9b7e1690a11c927b9ce22c619bb7d1dae10bec00d74a7d938f18e4ace0c73
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4B 5532 bytes
font_01_sfnt_off00010127.bin
b61d2970b603af61da17b89a88477176aea3f3c759ada7c1dfbc88d5b84f5181
pdf-font-stream PDF embedded font (sfnt) at offset 0x10127 11284 bytes