Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6a2ce144637e1b4…

MALICIOUS

PDF

111.4 KB Created: 2021-04-28 02:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6a8efd94f2eec35c115c6635f6e53c48 SHA-1: 84de1f50e96770b5423978447a8ab74da1b3977c SHA-256: f6a2ce144637e1b4ec9a6d41c4bf987e056ccb22520e37bc458afe4559a04331
146 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://midufefew.ru/strik?utm_term=transmission+line+modeling+a+circuit+theory+approach PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490523/normal_6041e2f175d76.pdfIn PDF document text
    • http://garant-ritual.online/zumuvekenekomuvoxedaxq8huz.pdfIn PDF document text
    • http://cashfree.store/tefazomosavi3uzt5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447877/normal_602d54e6bc3b2.pdfIn PDF document text
    • http://koxudizujan.mywebcommunity.org/65920228042.pdfIn PDF document text
    • http://nebo-baikala.ru/sap_abap_free_tutorialsjadwj.pdfIn PDF document text
    • http://evilcheats.fun/42502257127fot1o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403131/normal_5ffb46cfa2735.pdfIn PDF document text
    • http://siluvuxifebul.medianewsonline.com/43798462797.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452587/normal_5ffa153c2ed05.pdfIn PDF document text
    • http://loneresel.mygamesonline.org/34278930917.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e926c5f-5047-4a02-bbb0-949f91f71857/the_road_less_traveled_book_online_free.pdfIn PDF document text
    • http://fabevax.myartsonline.com/bible_concordance_online_esv.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/mission_mangal_full_movie_mp4_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/hush_hush_movie_update_2020.pdfIn PDF document text
    • https://a98f38e8-5810-4fc9-be6a-c3d78c7c4f9f.filesusr.com/ugd/921909_7c848f6e2fe742fb93b33f5f9543bf02.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7931cef-f26f-42bf-ab3d-b80559d56678/how_to_drain_water_from_top_load_washing_machine.pdfIn PDF document text
    • https://6739ca04-605d-4ff4-b4c9-4e5bd75a7819.filesusr.com/ugd/031dda_61e88043723e48c880f71a9b2c1372e3.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000158f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158F0 5536 bytes
SHA-256: f8241c926e29ec68a3496768730482cb68b365cef360473a39a61a3f5fe64a73
font_01_sfnt_off00016b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B9E 14252 bytes
SHA-256: 2c1c7b917599e35e63d765a491dd675bbfe6524415a6eea1c1a79fffb82fc8b5
font_02_sfnt_off00019b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B2D 16112 bytes
SHA-256: 944e710df818848ca137940eda4f1c4cfbd182819edacf0dc9c35b87066fb5db

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