Malicious PDF — malware analysis report

Static analysis result for SHA-256 a77c10106903e4ee…

MALICIOUS

PDF

113.7 KB Created: 2021-01-26 03:57:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: dd5a831a5aa7801e49d92e8a30667163 SHA-1: b7c63a343a08d91b8a9976f4f0dcd9a239439f7f SHA-256: a77c10106903e4ee8551444f2f3cada2e8c47b5045be91924646ad38c44a4703
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially malicious content or phishing sites.

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://seumenha.ru/123?utm_term=the+hunchback+of+notre+dame+characters+disney PDF link annotation
    • https://roriwemako.weebly.com/uploads/1/3/4/5/134599113/ebd5f602ecff.pdfIn PDF document text
    • https://cdn.sqhk.co/pumopivosoba/c5Wihjc/alex_hirsch_netflix_gravity_falls_season_3.pdfIn PDF document text
    • https://gatikewud.weebly.com/uploads/1/3/4/3/134382011/c219a4f48.pdfIn PDF document text
    • https://cdn.sqhk.co/fabukujeb/VbyPdlb/rijedojowipo.pdfIn PDF document text
    • https://cdn.sqhk.co/xejoxoka/sjajbix/11066801065.pdfIn PDF document text
    • http://yatvoyya.fun/kumuxawelibvm241.pdfIn PDF document text
    • https://porovepo.weebly.com/uploads/1/3/4/5/134527374/retujubi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ruxuwidoke.epizy.com/tubesorumifuzijemevipedu.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/fimazudod.pdfIn PDF document text
    • http://lixumogal.epizy.com/billi_punjabi_song.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/74745285097.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/android_auto_waze_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/casio_fx_991es_emulator.pdfIn PDF document text
    • http://rawozenagi.epizy.com/xelemisaxuveb.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/98667360165.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/le_brevet_est_til_reporter.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_off00017e86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E86 5484 bytes
SHA-256: 4531f66d086a965ab55577ea6e1bf8abfdf13a47c2bc47de00e42cca54d0a691
font_01_sfnt_off0001910d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1910D 12136 bytes
SHA-256: 01abb1ff6a9953f5b56b914df86775f5b0de1dc1b6ee131438d1a2cf487720f5

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