Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0f76ff8da42f9ab…

MALICIOUS

PDF

64.9 KB Created: 2020-11-28 12:31:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 975e7b9d1557326f412c7366322033a8 SHA-1: 1d1fb88861336202b75383eef67f50f88ce28ca9 SHA-256: a0f76ff8da42f9ab39a5d871930da0aa6f21a6c4bcbb3afa5742e159e6c3c70c
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 phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains like weebly.com, suggesting a link farm designed to redirect users to potentially harmful content. The presence of 'utm_term' in one of the URLs further supports a campaign-like structure.

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
  • 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://traffnew.ru/strik?utm_term=mckenna+forest+reserve PDF link annotation
    • https://nabutamu.weebly.com/uploads/1/3/4/5/134525390/7184727.pdfIn PDF document text
    • https://nijenemal.weebly.com/uploads/1/3/4/4/134465501/joriw.pdfIn PDF document text
    • https://gijepeparo.weebly.com/uploads/1/3/4/3/134318767/bd209003.pdfIn PDF document text
    • https://milavigik.weebly.com/uploads/1/3/2/8/132815866/9164513.pdfIn PDF document text
    • https://sonuboguf.weebly.com/uploads/1/3/4/3/134310015/48a340024c529ff.pdfIn PDF document text
    • https://besunuvoduzusub.weebly.com/uploads/1/3/4/2/134266379/2505058.pdfIn PDF document text
    • https://tabupuja.weebly.com/uploads/1/3/4/6/134647436/8362518.pdfIn PDF document text
    • https://radisowe.weebly.com/uploads/1/3/4/3/134366404/477974.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/4b71788b-aef9-4274-939e-1f829aa7b89f/13216680870.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/66287774254.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4eecc5c5-6447-4b69-ae70-bdfa908d1218/ridawesixa.pdfIn PDF document text
    • https://s3.amazonaws.com/roware/rogibitu.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_off0000c260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC260 4972 bytes
SHA-256: 3705fd563f6bc9e0659239c496ec7c27454ed076a5713c67c06d9bcf57d3cab9
font_01_sfnt_off0000d377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD377 10504 bytes
SHA-256: 78487b330f3111a6986c5598eb67e56f5c2e21b44aeb2b0efd8f85e18d6f78fa

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