Malicious PDF — malware analysis report

Static analysis result for SHA-256 355a2b3532cc0f77…

MALICIOUS

PDF

68.9 KB Created: 2021-03-29 19:28:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2218a0b43b052bb041cb0561174ca072 SHA-1: 56f5a94656525d5fb7609b421dab59e69ab29c74 SHA-256: 355a2b3532cc0f77755df184eb9ef6f1c3ecc3cf228a5b02e768d269a3574a18
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. ClamAV and ML classifiers identified this PDF as malicious, specifically flagging it as a phishing trojan. The presence of embedded URLs and the overall structure strongly suggest an attempt to lure users to external content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/123?utm_term=game+adventure+android+terbaik+2018 PDF link annotation
    • http://help-lnstagram-verifycopyrgiht.com/pirate_king_game_free_spins9xfby.pdfIn PDF document text
    • https://wefupavoxed.weebly.com/uploads/1/3/2/6/132682659/815fabf1.pdfIn PDF document text
    • https://cdn.sqhk.co/fujotojaxob/XPvheCm/pr_likes_followers_on_instagram_apk.pdfIn PDF document text
    • https://buluzuzumaz.weebly.com/uploads/1/3/1/6/131636727/f1b3db4bf44.pdfIn PDF document text
    • https://cdn.sqhk.co/nalujujoso/jt7XicZ/microban_24_reviews.pdfIn PDF document text
    • http://xuvivok.22web.org/kenodojegivapulagegus.pdfIn PDF document text
    • https://cdn.sqhk.co/pesuxitum/gjijehh/panukusepitevunajebubituw.pdfIn PDF document text
    • https://bejivuvepezera.weebly.com/uploads/1/3/4/4/134437422/8755679.pdfIn PDF document text
    • http://perevozka.ru/14941111287wqv6n.pdfIn PDF document text
    • https://foreguguwikib.weebly.com/uploads/1/3/0/7/130775698/15396ebb035.pdfIn PDF document text
    • http://instofficial.online/make_money_doing_online_surveys_ukzwsu1.pdfIn PDF document text
    • https://sakurulemiba.weebly.com/uploads/1/3/0/9/130969926/161690d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luwikomoxure.epizy.com/99704317707.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ad2ad8b-919b-4057-a469-a651969dc457/shrek_closing_book_meme.pdfIn PDF document text
    • https://1639490a-f715-481e-9fb1-af38d332269b.filesusr.com/ugd/a59130_e49161392ded404a854df6beb6a217e0.pdf?index=trueIn PDF document text
    • http://vojasokizew.epizy.com/52825069288.pdfIn PDF document text
    • https://f50ece36-1901-4a7b-9396-968a400df7f4.filesusr.com/ugd/3ecb95_9eeb10072a81490ab1e771acaa29386f.pdf?index=trueIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_e03fed5cabac410b99f6b67496351f6d.pdf?index=trueIn PDF document text
    • http://danexoz.rf.gd/37699273374.pdfIn PDF document text
    • https://c18d9829-3add-4afa-bc87-35007fe3998a.filesusr.com/ugd/70c1ec_da910119a9b74388ac808a46b5b51c31.pdf?index=trueIn PDF document text
    • http://dodadaxijer.epizy.com/budgeting_excel_spreadsheet_for_business.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2668c9f8-c94b-4f8c-ab12-cff2f7e19bb8/why_is_it_important_to_have_a_clear_speech_goal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c02b902a-1228-46fb-9c75-e0fa3c955668/how_many_chapters_in_the_shining.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb12f3bf-e212-40f9-bad8-73d43251e653/is_my_wood_stove_epa_certified.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_off0000cf9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9A 5576 bytes
SHA-256: 7aa6fad5ee9538ca07c803f4e4b46a78417147fe3c4f065fbf461a1d0ea98f41
font_01_sfnt_off0000e286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE286 10288 bytes
SHA-256: 12c467f8048ac779cb683e8cbabfce1fcbd6b9305414a277b9e79e8efd4d637d