Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc21621b21d07395…

MALICIOUS

PDF

69.3 KB Created: 2021-03-23 00:04:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 27bb202d05f46be1597573d3f7bb2f2b SHA-1: 7851f5d07fa8fd754c97974b106e4dfe0e0783c7 SHA-256: fc21621b21d0739546455131708b16f746d08735ce25bc6dadb80297c964d65f
186 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 pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification strongly suggests maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest an attempt to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://gimoguvi.ru/strik?utm_term=weber+spirit+ii+e-210+lowes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445890/normal_600c8ab7aee94.pdfIn PDF document text
    • https://cdn.sqhk.co/vizebika/8s4jbhe/vojiratumewazo.pdfIn PDF document text
    • http://kitafoged.medianewsonline.com/61374073543.pdfIn PDF document text
    • http://megidexabaror.mywebcommunity.org/wugum.pdfIn PDF document text
    • https://cdn.sqhk.co/dagufiwus/RhgkBRb/cheekh_ost_full.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/oghzmhg/linkin_park_meteora_album_cover.pdfIn PDF document text
    • https://cdn.sqhk.co/gazegarov/djhtdig/excursiones_msc_meraviglia_caribe.pdfIn PDF document text
    • https://cdn.sqhk.co/pabefidinaz/aifBtig/download_zombie_busters_squad_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/migawudewiw/8jeBDuL/enlighted_sensor_datasheet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390329/normal_5fc98bae60335.pdfIn PDF document text
    • https://cdn.sqhk.co/suwapipejob/bUhagiu/marketplace_phone_number_for_insurance.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375203/normal_6021eb5882d79.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373519/normal_5ff7dc9aacb9b.pdfIn PDF document text
    • http://zikevamakag.mygamesonline.org/diminolipodamakomir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sabiwilurase.atwebpages.com/5559742008.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e581534c-f9f5-48fd-8933-fdc3f2823257/bawilojorut.pdfIn PDF document text
    • https://e5447efa-8854-4d04-834e-f0bbd7438c8b.filesusr.com/ugd/ac612b_80c306217f5f47a9b73a115ab938fa13.pdf?index=trueIn PDF document text
    • http://luxupovokajaf.onlinewebshop.net/denusalegifajus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b8362b9-0af5-4ffa-afab-b8af551fcdb8/11_minutos_ultra_ritmos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46195e00-1e9b-4fd1-b520-0605e58e0115/49418494192.pdfIn PDF document text
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_f8b87559ecb3467b88670cffc0588239.pdf?index=trueIn 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_off0000d119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD119 5208 bytes
SHA-256: 95393d927855765953671eaf334e8efd2616234bd63e69d23cfdad76a61408c3
font_01_sfnt_off0000e304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE304 10904 bytes
SHA-256: 7d5a849365b43622edb861006e9374414e5097706eb66bedadbacec70ff4ff1f