Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe7b38a11a4d9857…

MALICIOUS

PDF

72.4 KB Created: 2021-03-02 11:10:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 9dc5a1b00798a3f9d9e622efd9a104f8 SHA-1: 2ce131f33cf389b3e80ab872c4c4a394148bac0f SHA-256: fe7b38a11a4d9857ab1cd90b98b3429c0aa26f1472ef1e758652edc801e618dc
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to other PDF files, indicating a link farm for SEO manipulation or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or trojan delivery. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed 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://leonvi.ru/wix?keyword=student+study+guide+chapter+4+supply+using+vocabulary PDF link annotation
    • https://zetaxufonepijak.weebly.com/uploads/1/3/4/3/134353616/6505843.pdfIn PDF document text
    • https://cdn.sqhk.co/xeduwukaxusa/mhgiiB2/jugesirawibeluziraxekof.pdfIn PDF document text
    • https://cdn.sqhk.co/sazoteva/hgzYRhe/best_mud_tires_for_2wd_atv.pdfIn PDF document text
    • https://revewodozuxun.weebly.com/uploads/1/3/1/3/131398596/6644ee8c.pdfIn PDF document text
    • https://tibufidis.weebly.com/uploads/1/3/0/7/130740046/faca1e9.pdfIn PDF document text
    • https://pijetupuz.weebly.com/uploads/1/3/4/3/134351396/tiloneviretav.pdfIn PDF document text
    • http://bitejodimoni.iblogger.org/able2extract_professional_free.pdfIn PDF document text
    • http://rivozuzeno.mywebcommunity.org/90363730648.pdfIn PDF document text
    • https://cdn.sqhk.co/goponebegor/iJSNTTs/62270221417.pdfIn PDF document text
    • http://webmastervlad.ru/43546076577uheqk.pdfIn PDF document text
    • https://bizarejix.weebly.com/uploads/1/3/4/2/134265425/naxujit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://saxodanokijaj.atwebpages.com/sumiwadimonogitagu.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/guided_walking_tours_lake_district_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/official_paris_metro_map.pdfIn PDF document text
    • http://zamutuxagen.epizy.com/movoziwu.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/68293710454.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/is_army_drill_sergeant_school_hard.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_off0000dd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD90 5828 bytes
SHA-256: 6c255016cbebdef0f4aa1aaeed571dbda7bb57b6d7865d5ddfff66ce7f781e9c
font_01_sfnt_off0000f178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF178 10228 bytes
SHA-256: 92739289aba80faecf1e72017d2958b12d4f471e030572a4eede30ddea7e413a

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