Malicious PDF — malware analysis report

Static analysis result for SHA-256 21726608a70a0dee…

MALICIOUS

PDF

77.5 KB Created: 2021-03-28 22:41:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 1a58bcd9a91a3e8990ab41f98a7156ab SHA-1: 9400527e454824b30ac08fcc9acd813236ef5054 SHA-256: 21726608a70a0deedb1f7d064d6735d24783a6aa20d2d6ba663bb16aaf78069e
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a site that appears to be a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to legal forms, which is a common tactic for phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/123?utm_term=free+residential+lease+agreement+form+ohio PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393369/normal_605ef82073ce9.pdfIn PDF document text
    • http://shopbest.online/874969291130cg40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367937/normal_6055697dc796f.pdfIn PDF document text
    • http://hairsprof.ru/18506962549k46fh.pdfIn PDF document text
    • http://baffer-shop.space/lamina_de_la_jarra_del_buen_bebershwny.pdfIn PDF document text
    • http://livecopyrightverification.com/fnaf_1_apk_mod_unlimited_powerv34og.pdfIn PDF document text
    • http://sakhavto.ru/i_am_zlatan_trailer46tgh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413983/normal_6016a93b57564.pdfIn PDF document text
    • http://arendagg.xyz/startup_business_plan_templatexw6cr.pdfIn PDF document text
    • http://es50off.pro/aarti_song_ganesh_freellpxn.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/3a5d4603-742c-472b-8004-de6e88c9dcf6/what_lucrative_business_can_i_start_with_100k_in_nigeria.pdfIn PDF document text
    • https://b304dada-1952-41b2-af44-d16a3232bb3f.filesusr.com/ugd/c19c34_171b32572be944f6ae138453084a54d8.pdf?index=trueIn PDF document text
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_2034ba37d8ea4e749a10536dbfa926f6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d26ddfbf-43bb-4a9a-bb7e-26df40ab52b3/follower_synonym_crossword_clue.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/85208034629.pdfIn PDF document text
    • https://s3.amazonaws.com/kiremefegonar/20969930480.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf6b7307-e5c8-4083-bf45-05b6f2f28b97/what_is_the_best_bible_reading_plan_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/27559886408.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_off0000f059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF059 5276 bytes
SHA-256: 7cbc1e99cc2ca03d912eef51c6b4508849f17126b6c84aec1fe6553221a840f2
font_01_sfnt_off00010224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10224 11272 bytes
SHA-256: a57ba5709416bf6b9648d5c41fab50aa525da26c2c2b64e0034314b5f16ac516

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