Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df16672e3a8a5a1…

MALICIOUS

PDF

83.6 KB Created: 2021-05-12 03:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1648a67ef66362d41abfd5cce8b5c5d1 SHA-1: e635971a5557e8314437a57f4d4e8f9936cc6538 SHA-256: 8df16672e3a8a5a14abaede9546bdcd60dce50d37e80c49868f7ceb10e7ef95d
244 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. One critical heuristic identified a link to a known malicious redirector. The document body, though partially corrupted, suggests a lure related to filling out a customs form, which is a common tactic for phishing or distributing further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=how+to+fill+out+usps+customs+form+2976-r In PDF document text
    • https://jirugewozori.weebly.com/uploads/1/3/4/8/134898712/8131099.pdfIn PDF document text
    • http://edarudost.online/xixoxiwaxolulokirawuvuta09sfo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380384/normal_5fd0c2058ba84.pdfIn PDF document text
    • http://cardio-active.site/68193738437d0i7x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388835/normal_6023d601630cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490516/normal_604bb9735b7eb.pdfIn PDF document text
    • http://fabulouss.space/real_steel_2_full_movie_in_hindi_480p81dje.pdfIn PDF document text
    • https://xoputiwi.weebly.com/uploads/1/3/1/4/131438532/6967012.pdfIn PDF document text
    • https://tajerupabud.weebly.com/uploads/1/3/1/1/131164315/8630588.pdfIn PDF document text
    • http://lianhua.life/gigufing6god.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459621/normal_6069ede3ca8f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450350/normal_600bc34807e97.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424982/normal_5fcf469a7b93b.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/bb8de3c3-341d-4e6a-9abb-be1bbf43af81/which_is_better_atari_flashback_8_or_9.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da4334da-aa33-4d74-928a-78af0d60a141/why_is_the_top_shelf_of_my_freezer_not_freezing.pdfIn PDF document text
    • https://f2203da8-4034-475c-a980-a37079f2cd7f.filesusr.com/ugd/d29026_351b105bfada4978b6688d1e0042870d.pdf?index=trueIn PDF document text
    • https://c07b3cb0-7d4a-4e65-9c62-eb3bd0ce3b6b.filesusr.com/ugd/7560d5_97b22ad05baa4cee8a1a5707d277a7b2.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_off0001055f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055F 5556 bytes
SHA-256: cf11359d47e17e7c1f70150168abc1f691df3d115d14230e15ba877c3f259b46
font_01_sfnt_off00011851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11851 11496 bytes
SHA-256: 42da094b3e518c7fa907e7915ed3f0f431dd1d9383b57323b592aed572bc015d

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