Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb0a207d956c42d…

MALICIOUS

PDF

85.4 KB Created: 2021-01-26 01:14:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b8aecee809ab4b05823eb19f9620cd69 SHA-1: 23b618313f04310487f9d99bd9799fd0fa7804ca SHA-256: 4bb0a207d956c42dc9e967d5a84d0ed8cb522172707a1ca56031f8f71ddae09f
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable domains, and one specifically lures users with 'google play games apk by uptodown'. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests it's part of a link farm designed for malicious distribution.

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://trafftec.ru/aws?utm_term=google+play+games+apk+by+uptodown PDF link annotation
    • https://cdn.sqhk.co/javomekoru/jvhfPNA/my_story_malayalam_movie_song_lyrics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418185/normal_600ebca8e72a2.pdfIn PDF document text
    • https://cdn.sqhk.co/susojareb/CBhgjhI/22381359623.pdfIn PDF document text
    • https://cdn.sqhk.co/xovatapegil/ajhW8hg/royal_farms_gas_station_ashburn_va.pdfIn PDF document text
    • http://makululi.iblogger.org/brick_out_game_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/relulapezele/ghiaQ9u/99963858353.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://litopuputorer.rf.gd/ziturot.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/98155347893.pdfIn PDF document text
    • http://birijigasexow.epizy.com/google_translate_app_for_android_offline.pdfIn PDF document text
    • http://magivaxinel.rf.gd/50969561624.pdfIn PDF document text
    • http://koxikid.epizy.com/calibration_standard.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_off0001122f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122F 5612 bytes
SHA-256: a79690ccbc9bf3b77444f2115faf3b3ea6e4359764ecfd4ff8bf3dba26c8e2e9
font_01_sfnt_off0001254b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254B 10536 bytes
SHA-256: e93ae4aee716b91edfc71159ceb882fb91b5b6b844171e88a71946e5a1b40863

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