Malicious PDF — malware analysis report

Static analysis result for SHA-256 7650c7d3dee2b175…

MALICIOUS

PDF

77.6 KB Created: 2021-06-07 07:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac646a2788ad273596cb54f7a0e951e2 SHA-1: e061ad5dd75a922a5f284232adc71e01604fdd29 SHA-256: 7650c7d3dee2b175a8e2deb40460a8dd3039f421253d2ef58ebb2d4b05d3d76d
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 payload. It contains numerous links, many pointing to disposable hosting, and one prominent URL that appears to be a lure for a Samsung update. The PDF structure and embedded links suggest it's designed to redirect users to malicious content, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/pbw?utm_term=what%2527s+the+latest+samsung+update
    • https://cdn-cms.f-static.net/uploads/4404723/normal_6011c32d58649.pdf
    • https://pobanebutu.weebly.com/uploads/1/3/4/5/134592169/7473168.pdf
    • https://pafirovax.weebly.com/uploads/1/3/4/6/134662293/tuboxisap.pdf
    • https://static.s123-cdn-static.com/uploads/4413363/normal_5fee82608d6f4.pdf
    • https://static.s123-cdn-static.com/uploads/4379610/normal_5feb0ab881b9d.pdf
    • https://cdn-cms.f-static.net/uploads/4415304/normal_602de0c8cfca3.pdf
    • https://sorurilinoko.weebly.com/uploads/1/3/5/3/135397097/8450429.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/31794303-2a32-41f2-b738-8d83e7aac239/degutesolu.pdf
    • http://farejutotej.pbworks.com/w/file/fetch/144684462/navevedekovegigozipufu.pdf
    • https://uploads.strikinglycdn.com/files/deb6d54a-486d-4d8f-8cf0-a1813953f6ad/robin_sharma_the_monk_who_sold_his_ferrari_book_review.pdf
    • http://kimotamiju.pbworks.com/w/file/fetch/144526284/let_god_guide_your_steps.pdf
    • http://kekirow.pbworks.com/w/file/fetch/144419583/fekakexurepubawuga.pdf
    • http://kosumepifise.pbworks.com/f/bigg_boss_season_1_tamil_full_episode_youtube.pdf
    • http://labidan.pbworks.com/w/file/fetch/144478986/15388266827.pdf
    • https://uploads.strikinglycdn.com/files/6511402a-2a68-4aec-82f5-381d5070fc3a/fake_driving_license_pakistan_maker.pdf
    • http://veniwusuj.pbworks.com/f/xuwezavifedop.pdf
    • http://wekibivu.pbworks.com/f/sudoji.pdf
    • http://xoxafepapesu.pbworks.com/w/file/fetch/144729267/pumorit.pdf
    • http://gudotoxej.pbworks.com/f/mijumutewobojinakejupeso.pdf
    • http://xosufixemuf.pbworks.com/w/file/fetch/144442302/nununul.pdf
    • http://kefimazusob.pbworks.com/w/file/fetch/144574497/camscanner_ad_free_apk.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_off0000f124.bin
5a679338a53d30d60fa8a3b0e7373eb332467500705d6e69ececf86cfed0d890		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF124 5324 bytes
font_01_sfnt_off0001032d.bin
2af2259f30bd717c3407505d4bc5bcb33d8887b928233217d409c495f14be7c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1032D 11224 bytes

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