Malicious PDF — malware analysis report

Static analysis result for SHA-256 992788d1f16e33c2…

MALICIOUS

PDF

77.1 KB Created: 2021-03-25 10:58:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a17c1757e822923ab34016b57f9360b0 SHA-1: aefbf6a0a0961e51a2ad86bcaccfbe34df897c71 SHA-256: 992788d1f16e33c2079704f22825d4e9938e626084a44ccfc7c0c1ae25aa2702
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 0.9990

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://vilenefex.ru/strik?utm_term=porque+es+importante+conocer+la+metodologia+dela+investigacion PDF link annotation
    • https://zemedabumudog.weebly.com/uploads/1/3/2/7/132712209/xifirigenero.pdfIn PDF document text
    • https://cdn.sqhk.co/gupimupiset/CTehjid/69509530492.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415327/normal_6009af1f00bc7.pdfIn PDF document text
    • http://lixejinokegiror.22web.org/how_to_make_burgers_on_cuisinart_griddler.pdfIn PDF document text
    • http://zanartcc.net/655052081307m54m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372373/normal_605be11706f2f.pdfIn PDF document text
    • https://jowapiwinutakun.weebly.com/uploads/1/3/4/3/134365581/sekamuwugekedes_sanubevugujoba_wipuriseneroku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379384/normal_60207a274f8a6.pdfIn PDF document text
    • https://fotawadibegul.weebly.com/uploads/1/3/1/1/131163643/peloru-jebav-gubulobeno-ragawujifepif.pdfIn PDF document text
    • http://autocredit.moscow/59067552985keo42.pdfIn PDF document text
    • https://boriduleloson.weebly.com/uploads/1/3/4/0/134012687/4112371.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453901/normal_60143d2b0edd4.pdfIn PDF document text
    • https://dutagoloz.weebly.com/uploads/1/3/0/8/130814416/jefevifabukozen.pdfIn PDF document text
    • http://girlsbeach.space/milawefscl3v.pdfIn PDF document text
    • https://cdn.sqhk.co/rapigufagi/bbxTmt7/short_life_quotes_for_instagram_bio.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sobunase.epizy.com/alejandro_casona_la_dama_del_alba.pdfIn PDF document text
    • http://baxudoxubalafe.epizy.com/76621808546.pdfIn PDF document text
    • https://6c639bf1-704a-4500-b661-329758898742.filesusr.com/ugd/02d620_ef5530d4b9e146b789def34ceb844cce.pdf?index=trueIn PDF document text
    • https://bed1e925-73f7-457c-87ff-53f226988024.filesusr.com/ugd/d4a8ce_9f216ca1a136491cb60a30d59fba7491.pdf?index=trueIn PDF document text
    • https://0bc2ebcf-5b85-435c-8290-6c6350a165f2.filesusr.com/ugd/ee98f5_c8b5cc1f5d1c49d0bb586be647159968.pdf?index=trueIn PDF document text
    • https://580b68e3-2104-4118-ae5b-4f285de1c062.filesusr.com/ugd/dad7b5_37ba57b1a46b44ff988e0958c0b4510f.pdf?index=trueIn PDF document text
    • https://7d7e9a41-1eea-4c72-a0b8-c0e3d642de37.filesusr.com/ugd/513cfa_ba7b286f2e9f4383a56cef7c26ae93a6.pdf?index=trueIn PDF document text
    • http://xamojaxul.epizy.com/word_problems_multiplication_5th_grade.pdfIn PDF document text
    • http://gikuzeviseg.rf.gd/14240222574.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_off0000eb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB63 5580 bytes
SHA-256: a61ffd3867f6510b73d69e71f19b9c9f71e17cdcd0d8ae6c3dedc049b2d03690
font_01_sfnt_off0000fe46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE46 11692 bytes
SHA-256: e9c0aaab0fd4e1082585ef4505567a3530d6b8260b796679bccda72bee4677c4