Malicious PDF — malware analysis report

Static analysis result for SHA-256 c753c9d78377a62d…

MALICIOUS

PDF

78.5 KB Created: 2021-03-22 18:57:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 9071449008444c030d26b58aeeaee407 SHA-1: 1d4621fe85820d2370e8857d09dc01ef96a55f37 SHA-256: c753c9d78377a62da135cb0ef3167d4da2444b43cf7392a0a53401a863727417
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 hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a phishing or malicious redirection scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dugedepap.ru/strik?utm_term=sennheiser+hdr+120+specs PDF link annotation
    • http://tatanip.medianewsonline.com/gexug.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381730/normal_5fc7cd6a75243.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366976/normal_603b0553d51c7.pdfIn PDF document text
    • http://giwapozolaleg.mypressonline.com/2003_infiniti_g35_automatic_transmission_fluid_capacity.pdfIn PDF document text
    • http://xilasojere.iblogger.org/35919838288.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415950/normal_5ff7c8e85a93c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412996/normal_6056fc6be2aea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423148/normal_5fe93a5508e86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378845/normal_602f7011576c4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/wenizefobumubus.pdfIn PDF document text
    • http://ximitexus.epizy.com/burma_tamil_movie_in_tamilrockers.pdfIn PDF document text
    • https://s3.amazonaws.com/vasofirida/69661510462.pdfIn PDF document text
    • https://17851959-1482-4b49-8222-7b7b0c628459.filesusr.com/ugd/3cb679_0d005de99e964d64a1932a44bcc19cda.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zagubip/9880527079.pdfIn PDF document text
    • https://8650d040-a33d-467d-a608-6706f181f11b.filesusr.com/ugd/61b8bf_74ef51b865434d3fbcdd6576d6db0440.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_off0000e694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE694 5348 bytes
SHA-256: f251dbd4bf9b9214b68de7313727873a9924470be4514bdc8f8eaf0d97b44650
font_01_sfnt_off0000f8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C5 19636 bytes
SHA-256: 70da88a6e9454aee7325089a1bac4369319c1c997a807619eeda1a6e39817a68

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