Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9c834e5a0fe961d…

MALICIOUS

PDF

70.8 KB Created: 2021-04-29 18:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b66d4f6a15389633c2a4a3a2d83ce9a0 SHA-1: bb1ae9747dbf032683b8ea762df7a6981f67a17a SHA-256: f9c834e5a0fe961d1b40cdf2247d8dd61621e72f706d906f77c3b1c6d4c34b4a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a suspicious domain associated with a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and the link farm heuristic suggest the document's primary purpose is to redirect users to potentially harmful content.

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://jumiwimov.ru/strik?utm_term=amr+rancho+cucamonga+human+resources PDF link annotation
    • http://worldhold.online/kali_linux_tutorialca3aw.pdfIn PDF document text
    • http://nalejodugo.iblogger.org/mevijozonexina.pdfIn PDF document text
    • http://fapseo.ru/que_es_un_bucle_while_en_programacionid504.pdfIn PDF document text
    • http://ig-verifiedsbadge.com/keto-enol_tautomerization_is_an_important_mechanism_in_glycolysis._what_does_this_involveclr8z.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/5d5654ba-348c-4cac-a292-fdb53d517f84/minn_kota_powerdrive_bt_45_spot_lock_micro.pdfIn PDF document text
    • http://remokulepene.rf.gd/gamegusokoni.pdfIn PDF document text
    • http://nowaginog.epizy.com/motozenokurafu.pdfIn PDF document text
    • http://metepukiwameme.epizy.com/sony_wega_tv_model_kp-51ws520.pdfIn PDF document text
    • http://keluwuvofaj.epizy.com/camera_scanner_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/scientific_method_practice_problems_answers.pdfIn PDF document text
    • http://werapitagu.rf.gd/alternator_repair_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/subject_verb_object_ks2_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce91edcd-8e11-4ba4-97f0-aaad3bb3370e/48368450128.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0d44ec9-be9b-489e-9932-4a9340ab1595/fasawujuzuritufub.pdfIn PDF document text
    • http://tiribopur.rf.gd/tosewajovilolitaden.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4345db68-2f01-49a2-a065-85ffd5f23295/58311105324.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_off0000d6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C0 5168 bytes
SHA-256: 3f9d2782225087ca1db1b6956b3819ad1e21fa9e26696904f72f49f5d2dc49dc
font_01_sfnt_off0000e827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE827 10728 bytes
SHA-256: 76fe8e60d4cecffbf3eb9b3bb2d014aa718af42dd14915f2ab81aeb16214f6fb

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