Malicious PDF — malware analysis report

Static analysis result for SHA-256 d69c31b478c3bb5a…

MALICIOUS

PDF

74.9 KB Created: 2021-04-01 09:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 8e0a69eb4304477363beea3998ab410c SHA-1: 800faca8cc0787136280cbf573cad626f57914be SHA-256: d69c31b478c3bb5afc304b5d3aafec6146021c2de665248b8766e8ff9d3623ea
186 Risk Score

Malware Insights

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

The sample was detected as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs, some hosted on disposable domains, which is a common tactic for phishing or distributing further malware. The PDF_SEO_LINK_FARM heuristic specifically highlights the presence of 30 external links, many pointing to potentially untrustworthy sources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/wix?keyword=50%252F50+challenge+anime PDF link annotation
    • https://cdn.sqhk.co/xegunorasu/1Hgeeb5/free_throws_or_pink_bows_cake_topper.pdfIn PDF document text
    • https://cdn.sqhk.co/fakodozug/j4he3Rb/castle_wars_halo_5.pdfIn PDF document text
    • http://dorulezebum.sportsontheweb.net/dell_inspiron_3847_mt.pdfIn PDF document text
    • http://usesoda.pro/53473087159s196o.pdfIn PDF document text
    • http://websporizlehd.com/scott_brown_otorhinolaryngology_free_downloadfccut.pdfIn PDF document text
    • http://milanomoda-italy.website/81856026049q2lb1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_3a6d8a0f25594d2f85d2ed9524bb31eb.pdf?index=trueIn PDF document text
    • https://b86313a8-447b-404d-ae6d-bc69740d899e.filesusr.com/ugd/e54fc7_c844388e17e148dc9138bd078228f362.pdf?index=trueIn PDF document text
    • https://a6132035-7465-4fe4-be4e-2faa96c22dab.filesusr.com/ugd/cf950b_77d27fa244d64267ba3afc1440e4a5e7.pdf?index=trueIn PDF document text
    • https://0e75ab8e-f6a1-4360-bef2-1d94e06fde4e.filesusr.com/ugd/c0518c_0c7cc5e284f44e40963797be3ea859e5.pdf?index=trueIn PDF document text
    • http://bafasoronejero.epizy.com/wigowiti.pdfIn PDF document text
    • https://3d1db4d0-c196-4dd3-8d5c-bb108cafbd43.filesusr.com/ugd/479e38_d62c63e9b7864acb847e2c6b0df7a53e.pdf?index=trueIn PDF document text
    • https://1423d76f-a56f-4481-bf87-726e17039346.filesusr.com/ugd/14aee2_c8e20e3f1af94ecdb16aae43398087ea.pdf?index=trueIn PDF document text
    • http://lanikudawojag.rf.gd/dihybrid_cross_cheat_sheet.pdfIn PDF document text
    • http://mixezized.myartsonline.com/complications_of_bariatric_surgery.pdfIn PDF document text
    • https://2c8134a4-d865-4da1-8961-c755d7242105.filesusr.com/ugd/6dcf04_ec5ff119eada47b6bda5f243ea2c4b94.pdf?index=trueIn PDF document text
    • https://72cee60b-533f-4fda-9f40-87b1bb6f0553.filesusr.com/ugd/590778_c9bd788aa29340dc99afebab71ce82fb.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E6 5148 bytes
SHA-256: cd2884de03a74808c738dbb8761a7a56474aefcf98648e5181503f85c7dce1c1
font_01_sfnt_off0000f74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74F 11496 bytes
SHA-256: 22e23b3e23f142fc2eb9218e25179a82d52d5c69a1238c82a55e234ac1703da0

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