Malicious PDF — malware analysis report

Static analysis result for SHA-256 935938122f1dfe24…

MALICIOUS

PDF

70.4 KB Created: 2020-12-06 22:19:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 8e6f10f67256a0546d65c343fb195f58 SHA-1: 16aaec3745a59a160b5dc94b5239973316018c71 SHA-256: 935938122f1dfe243c5b046eb3ee70557ea54027e97126482b753f6ee12859be
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to link farms designed to manipulate search engine results. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://trafffe.ru/123?utm_term=psicologia+social+definicion+pdf PDF link annotation
    • https://sebiwijojemobod.weebly.com/uploads/1/3/4/0/134097571/metugisina_jusujabozep_kubozojofoxib.pdfIn PDF document text
    • https://zaruteso.weebly.com/uploads/1/3/4/7/134716260/69d90dea35.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0cf2e60f2895dc1e766a0/t/5fc32a0e5147b148049a7912/1606625807181/lizuj.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f171c14dfd36fef1b44e/t/5fc834c792e74531f3c29149/1606956235827/wiroseruwigodumo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd27764f21657362f41879/1606231929220/shark_navigator_nv22s.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/ratatouille_google_docs_english.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/boss_baby_birthday_template.pdfIn PDF document text
    • https://s3.amazonaws.com/midipes/rajukaminixafibefowedada.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf09145ca4f790264e72a/1606217875018/21696206830.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc11e8e16f6d44b07c01948/t/5fc4ec5918e72e5fdb72a806/1606741082612/sorazofejevuvutexelulij.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/mepamaxusaxemig.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f2f6c89e1c4b8fbea157/t/5fc27b375147b14804831869/1606581049192/the_grain_cafe_locations.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/garisaratigosenilagapiti.pdfIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/cypress_creek_hoa_grant_fl.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc104e3405d5340f32a388f/t/5fc8480890a4f8549d72e2eb/1606961160511/mexisibeteji.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_off0000d6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CD 5228 bytes
SHA-256: d4a6d3567207c85a7ab1445b068ab783304596e02c883c39d69c177f7dd76691
font_01_sfnt_off0000e8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B8 10536 bytes
SHA-256: 20259a45e95fce3cfce0c64f2bb8a3d539e9e8aa897dd86672643cb1c6a12875

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