Malicious PDF — malware analysis report

Static analysis result for SHA-256 600406740efee4ef…

MALICIOUS

PDF

70.1 KB Created: 2021-06-05 03:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 1ea51af63c3c45879a74d68070883c27 SHA-1: bfec6e77dc9b000aa579b72cd2821ae774871588 SHA-256: 600406740efee4efffdd0fd007291a7b6e79043aa1a4f968531d85b5cc469451
126 Risk Score

Malware Insights

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

The PDF contains numerous external URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. ClamAV and an ML classifier have flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest the PDF's primary function is to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://garglob.ru/pbw?utm_term=atlas+patologi+anatomi+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4390350/normal_5feb86f6c6b4e.pdfIn PDF document text
    • https://tamoniwezetiro.weebly.com/uploads/1/3/5/9/135961995/2348135.pdfIn PDF document text
    • https://vavemome.weebly.com/uploads/1/3/4/6/134609594/gewegad_levotenixababis.pdfIn PDF document text
    • https://wusedutewaxugag.weebly.com/uploads/1/3/1/4/131437839/roxaxupigelo-nixalonu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422392/normal_6032e8d04999f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390661/normal_5fe5d7e372345.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402250/normal_600df786a95eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366965/normal_5fde83ea2da1a.pdfIn PDF document text
    • https://letosuve.weebly.com/uploads/1/3/0/7/130739520/bovixekex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487905/normal_5fce3de412274.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496605/normal_60355e22043cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411935/normal_5ff2f0b984b0e.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4371267/normal_60b3dd32e19bb.pdfIn PDF document text
    • https://garugufalavul.weebly.com/uploads/1/3/4/5/134507034/33f0ba6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418167/normal_60343cecad5f0.pdfIn PDF document text
    • https://dodonixufaf.weebly.com/uploads/1/3/1/4/131453867/mogoba-lalidagas.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/019fc36b-9e59-4f1e-abcd-43acb6a8f3e8/does_dunkin_donuts_blueberry_coffee_have_sugar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a5d7a36-d2aa-46ea-93df-66c5ebf5ef6f/in_the_heart_of_the_sea_tom_holland_and_chris_hemsworth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b987c864-216f-4f0a-9b1d-d18bc3c99f2a/72329854987.pdfIn PDF document text
    • http://mutoteja.pbworks.com/w/file/fetch/144515229/71437390312.pdfIn PDF document text
    • http://vifogajo.pbworks.com/w/file/fetch/144485403/operations_and_supply_chain_management_mba_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63f955fc-74fd-499b-9f06-d7743972a655/xidenugisewetukevav.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_off0000d217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD217 5256 bytes
SHA-256: f2ff11814be8421b5882b106fde3abf98185a2ebff4861a8c2af8bc41d48ac62
font_01_sfnt_off0000e3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3ED 11704 bytes
SHA-256: f7d70d4af92f3e8fac5d385f86d9f8323cdf0dd8551f31531b1132ebd75d41b6