Malicious PDF — malware analysis report

Static analysis result for SHA-256 426c07862e2c8e4b…

MALICIOUS

PDF

82.5 KB Created: 2021-01-12 00:04:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d6b1fcdc56c682d4b3b4265f240bf8c7 SHA-1: ec32d5438b274ab078e745f2379073e62ffe2b78 SHA-256: 426c07862e2c8e4b56fc170efbf9423a1ba34b25a33a093df6e7bf5e3e1f8e14
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, appears to contain text related to 'Employee retention strategy template', likely a lure. The presence of numerous links on disposable hosting and the ClamAV detection strongly indicate a phishing or malware distribution attempt.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/aws?utm_term=employee+retention+strategy+template In PDF document text
    • https://site-1173941.mozfiles.com/files/1173941/stickman_runner_3d.pdfIn PDF document text
    • https://site-1171722.mozfiles.com/files/1171722/2021_forest_river_cherokee_arctic_wolf_3660_suite.pdfIn PDF document text
    • https://site-1177041.mozfiles.com/files/1177041/identity_vs_confusion_importance.pdfIn PDF document text
    • https://site-1172210.mozfiles.com/files/1172210/xikezulavaduvalovov.pdfIn PDF document text
    • https://site-1176958.mozfiles.com/files/1176958/directv_packages_channels_comparison.pdfIn PDF document text
    • https://cdn.sqhk.co/kupodakojav/UhfhjO2/nomasusemaxepanodomak.pdfIn PDF document text
    • https://site-1171826.mozfiles.com/files/1171826/nukafokederudug.pdfIn PDF document text
    • https://site-1175316.mozfiles.com/files/1175316/vamudojezozarelewojete.pdfIn PDF document text
    • https://falizuzu.weebly.com/uploads/1/3/4/5/134506804/47832.pdfIn PDF document text
    • https://site-1172793.mozfiles.com/files/1172793/home_design_my_dream_garden_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/zunesunatiri/jbMX2ie/flappy_bird_game_over_png.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/minegikukovel/4821566041.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/wekewonafozadozes.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/70354321067.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_off00010697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10697 5200 bytes
SHA-256: 042404ce4ce85a17df251362ab2ebf9c9216c16c4601cc3005c0ba6f99309392
font_01_sfnt_off0001183c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183C 10712 bytes
SHA-256: fb2ad59f9ae401ad87ae65cff04157472118753087d8a60990a4996854273dfd

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