Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4839935b48ca449…

MALICIOUS

PDF

79.4 KB Created: 2021-04-03 02:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 51951f8b3fd096ad50e61da94d4398e2 SHA-1: af8c58b3f5f279e0f6890e906226204dba3594ee SHA-256: e4839935b48ca44959caf85a2b94ccbaa8742a8295993a9f6b351ea5cdc63c21
186 Risk Score

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. 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 0.9994

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://soxebez.ru/wix?keyword=yahoo+video+guide+app PDF link annotation
    • https://gegadibiliwo.weebly.com/uploads/1/3/1/8/131871883/bitot_tokitupapewe.pdfIn PDF document text
    • https://keziputaxa.weebly.com/uploads/1/3/2/7/132711938/1143024.pdfIn PDF document text
    • http://disclosures.space/vivowon4s9h5.pdfIn PDF document text
    • http://verifedform.com/13598898952wi4j2.pdfIn PDF document text
    • http://sevastopol.sale/how_much_is_a_capacitor_for_a_citizen_eco_drive_watchr06em.pdfIn PDF document text
    • https://minunelojob.weebly.com/uploads/1/3/1/4/131453060/5607077.pdfIn PDF document text
    • https://golakabuzoved.weebly.com/uploads/1/3/4/8/134870140/jifunuk.pdfIn PDF document text
    • http://tdsevsvet.ru/bsa_scout_leader_uniform_patch_placementfl7g7.pdfIn PDF document text
    • https://latifaxegorur.weebly.com/uploads/1/3/5/4/135400737/1038741.pdfIn PDF document text
    • http://bettermoneytips.com/baby_gate_play_yardhdkbv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6c639bf1-704a-4500-b661-329758898742.filesusr.com/ugd/02d620_d1e80b2ef77148a5a6eba1707c27d7d1.pdf?index=trueIn PDF document text
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_b97401cd76994931a1fa22ed3aa8aae3.pdf?index=trueIn PDF document text
    • http://fabavokawibawo.epizy.com/pdf_to_word_converter_without_losing_formatting.pdfIn PDF document text
    • https://1ceef7f3-d523-4f80-a0a4-3aed54d3d17a.filesusr.com/ugd/48841a_03e4fe3fd92a4f65b18349a2cc1737e5.pdf?index=trueIn PDF document text
    • https://fed4949e-3809-4fc0-a28b-84c5d390f589.filesusr.com/ugd/94482e_4ce97d1be7294aa5b82db5490e304e84.pdf?index=trueIn PDF document text
    • https://170a7d3c-74f0-42f5-9ead-98ae292a4922.filesusr.com/ugd/a18aa6_ee4eb4fe355f417683a2f56f5d73acf8.pdf?index=trueIn PDF document text
    • https://8533cbf3-c0d6-400c-bdf8-8ca38cf0242b.filesusr.com/ugd/135178_f2bb76cfd68f4c2b84427daa8e8163e3.pdf?index=trueIn PDF document text
    • https://e8ceee85-86bf-4804-80ab-d7a1511cbcf5.filesusr.com/ugd/38650a_2678f4ffb3de47048d6eddcc02c10d8a.pdf?index=trueIn PDF document text
    • https://167c8e7b-8160-49a2-a88e-f26749d647c8.filesusr.com/ugd/1ad47d_100fcb8c96e24ca784db6055122c6e7c.pdf?index=trueIn PDF document text
    • http://sokogukuvuxe.rf.gd/51661936182.pdfIn PDF document text
    • https://8c1dc56a-a131-4b43-acff-3635b9115217.filesusr.com/ugd/90423f_3e79e72f2af7416282593052c33f94d7.pdf?index=trueIn PDF document text
    • http://zibinafo.rf.gd/sb_banjara_songs_mp4.pdfIn PDF document text
    • http://wefexafunedex.epizy.com/bipuvekazum.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_off0000f9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F3 4936 bytes
SHA-256: 395b2c43f0186ec7d5a72a4102b53ae1eed766b2ce68917e3184c3e813295646
font_01_sfnt_off00010ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACE 11104 bytes
SHA-256: 978800d2b2b9d2c56ba3f33c99a67799a5fae1d6a753e61f097c077f0a6c0404