Malicious PDF — malware analysis report

Static analysis result for SHA-256 56aa8072a015998d…

MALICIOUS

PDF

63.1 KB Created: 2020-12-29 19:13:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 4ac7220dd463dbca7851a455dcfb37b3 SHA-1: d590a61325e15f9d8f82a9923ce1f547434f927f SHA-256: 56aa8072a015998dbafaa039344fde49c0ae9240e0236fb277248044f7b4c7a7
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, including ClamAV's Pdf.Phishing.Trojan signature. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though truncated, contains keywords related to wallpaper, which likely serves as a lure to direct users to the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/strik?utm_term=pink+and+silver+glitter+stripe+wallpaper PDF link annotation
    • https://cdn.sqhk.co/kewudomavave/nhfgphi/17413767497.pdfIn PDF document text
    • https://ligexomapaku.weebly.com/uploads/1/3/4/3/134321337/1143219.pdfIn PDF document text
    • https://kusavavatixe.weebly.com/uploads/1/3/4/8/134878613/numixefibo-vuroxuruj-gipevilizitojiz-ninugudebabapax.pdfIn PDF document text
    • https://mujolimu.weebly.com/uploads/1/3/4/8/134868529/6844766.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385436/normal_5f9a7c89815ad.pdfIn PDF document text
    • https://cdn.sqhk.co/kedezoge/icpigYW/standard_sunday_school_lesson_january_19_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/pevejotomoma/hbideja/22645919457.pdfIn PDF document text
    • https://buxivadoga.weebly.com/uploads/1/3/0/7/130740323/7084432.pdfIn PDF document text
    • https://cdn.sqhk.co/fasixazijaz/ijhjfbB/hepatitis_a_vaccine_schedule_before_travel.pdfIn PDF document text
    • https://cdn.sqhk.co/bavomizobe/koggiej/84797127297.pdfIn PDF document text
    • https://xovatikawe.weebly.com/uploads/1/3/4/7/134726086/wafaribikova-xubotikomabana-zitanaxedaga-wukagogajuv.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/cjcjjWn/76254357464.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1154712-ca5d-4736-ba8e-9f04a75f1266/8535497386.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_off0000bc1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC1A 5344 bytes
SHA-256: 84f5187b86245157a98d19c8ef049af39ea6e9ecb3d95434665c2b565b35bde8
font_01_sfnt_off0000ce6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6F 9676 bytes
SHA-256: 8b430f3bd09cb218ea79fb39b96a35b5c45cea705accf2eadbae2352a6dd8aa8

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