Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa4983dbfbb1ea20…

MALICIOUS

PDF

74.8 KB Created: 2021-02-19 06:15:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 49f0d07656246b2c15c44350c8704bb1 SHA-1: 850c16b4574d7d1bc346d14913997a4a65bbfc58 SHA-256: aa4983dbfbb1ea20bbd34b0f397c594b1613fd28326b17f8ee957fb939ff7d73
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains and potentially malicious PDFs, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it may be used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://leonvi.ru/strik?utm_term=spd+sx+sampling+pad+software PDF link annotation
    • https://cdn.sqhk.co/konumapedowe/XNuUUhi/zilatek.pdfIn PDF document text
    • https://wapapoda.weebly.com/uploads/1/3/4/5/134581042/govasi.pdfIn PDF document text
    • https://wutejaguruloz.weebly.com/uploads/1/3/1/8/131871665/jononarisopad.pdfIn PDF document text
    • https://tawigijonepoter.weebly.com/uploads/1/3/4/0/134012415/wurimawiva.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463824/normal_5fcbf9bc4c496.pdfIn PDF document text
    • https://cdn.sqhk.co/mugolino/ahbsjfq/paper_pen_writing_icon.pdfIn PDF document text
    • https://cdn.sqhk.co/gubisagebuto/qjft9Vk/notepad_app_free.pdfIn PDF document text
    • https://ledapenilodaro.weebly.com/uploads/1/3/1/0/131070651/6928466.pdfIn PDF document text
    • https://cdn.sqhk.co/sabimejuka/dhijhjf/45173820811.pdfIn PDF document text
    • https://cdn.sqhk.co/surudije/jd7BdUn/limbo_meaning_game.pdfIn PDF document text
    • https://revewodozuxun.weebly.com/uploads/1/3/1/3/131398596/pidiwamuziparafikeb.pdfIn PDF document text
    • https://cdn.sqhk.co/pobopuwubox/iidhoYg/79305697894.pdfIn PDF document text
    • https://cdn.sqhk.co/legusovej/eNZiiib/jozitojikijonerumarebu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416151/normal_5fe77c4bc60a1.pdfIn PDF document text
    • https://cdn.sqhk.co/zojixemem/AIBihij/mcdonald_s_holiday_hours_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459163/normal_5fd663b37e169.pdfIn PDF document text
    • https://cdn.sqhk.co/sokaxopoje/iHp6Oua/78698542292.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498978/normal_602c08b336284.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/hernia_inguinal_pediatria.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/laser_cut_metal_sheets_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/hipaa_violation_reporting_phone_number.pdfIn PDF document text
    • https://s3.amazonaws.com/dofufiri/angry_babies_full_movie_free.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_off0000e564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE564 5624 bytes
SHA-256: 12743b81013ee0b1d5414bad8201c5c1adf7d92198110628abeee78232661732
font_01_sfnt_off0000f88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88B 10956 bytes
SHA-256: d378efd696faff43fbaa642e213e92467f8ae4e0dc4531f5233454ac325b8d27

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