Malicious PDF — malware analysis report

Static analysis result for SHA-256 66983aba188baca5…

MALICIOUS

PDF

68.8 KB Created: 2020-12-21 12:39:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 2b613a5e489cfb53b4dd9b6d36e510c1 SHA-1: 9da86698a81587fd6fa786becfcdffdb39c29e25 SHA-256: 66983aba188baca5da33007d87d0f66e6a82f24fc9e7c1e15c085066705c1018
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous external URLs, many hosted on disposable domains, suggesting a phishing or spam campaign. The document body, though heavily obfuscated, appears to be a lure related to a 'Nevada dmv cdl manual'. No scripts were extracted, but the presence of a link farm and the overall detection profile strongly suggest it's used to redirect users to malicious sites.

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://trafffi.ru/123?utm_term=nevada+dmv+cdl+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416154/normal_5fc7453ec64dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410717/normal_5f9936689382f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392660/normal_5f9184b6248ec.pdfIn PDF document text
    • https://teraxumafelenug.weebly.com/uploads/1/3/4/7/134747654/gilunigibumirizoli.pdfIn PDF document text
    • https://rosanibo.weebly.com/uploads/1/3/4/8/134873488/8489985.pdfIn PDF document text
    • https://virenejamavik.weebly.com/uploads/1/3/4/1/134131854/a4113.pdfIn PDF document text
    • https://dobaviwipiz.weebly.com/uploads/1/3/4/7/134766835/fb1166a6900d.pdfIn PDF document text
    • https://gupufema.weebly.com/uploads/1/3/4/4/134456882/daribumaruk-sizegud.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/263f7020-a470-4918-bbe7-83876f909d3f/tobokaralimazaveguse.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/52999585937.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_off0000d12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12A 4840 bytes
SHA-256: 5a10e50d66bb874850ee09bd8a5cfea5ff8cae959430f5315618003c5b9ff900
font_01_sfnt_off0000e19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19B 10896 bytes
SHA-256: 6efb23b0c915dbf285536a4fa07f296ab29cb6482bb83d3e2ca6121ce990129b

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