Malicious PDF — malware analysis report

Static analysis result for SHA-256 54cf2cfffe42fa9d…

MALICIOUS

PDF

77.2 KB Created: 2021-02-21 14:50:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5e7a4eb69cb584c3e9c01f22acbdce27 SHA-1: 7ec975846d9caebf778c3c04fc175262ca226f02 SHA-256: 54cf2cfffe42fa9d2ee8673d1b9bafe90b30fa79ae59c19694c3daec42f3b125
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, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URLs point to various domains, some of which are hosted on disposable platforms, further supporting a malicious purpose.

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://baarspo.ru/wb?keyword=what%20is%20yoga%20according%20to%20bhagavad%20gita PDF link annotation
    • https://gadonivoxe.weebly.com/uploads/1/3/5/3/135331758/taguzikuwa.pdfIn PDF document text
    • https://safamitiwifiro.weebly.com/uploads/1/3/0/7/130739579/6283619.pdfIn PDF document text
    • http://urolog.xyz/89142598015ru6ww.pdfIn PDF document text
    • http://filmera.ru/buccal_route_of_drug_administrationnrxq9.pdfIn PDF document text
    • http://shoop-fp.ru/how_to_install_eso_addons_manuallykw46r.pdfIn PDF document text
    • https://kumupesefutevun.weebly.com/uploads/1/3/4/4/134463509/pojesemoni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527902/normal_60287bd838d16.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412758/normal_5ffa076358f9c.pdfIn PDF document text
    • http://natur-green.fun/43754813562p25nx.pdfIn PDF document text
    • http://yandex-dostav.ru/present_simple_present_continuous_past_simple_exercises_text42s3x.pdfIn PDF document text
    • https://sapigufebo.weebly.com/uploads/1/3/4/5/134592603/xusapo.pdfIn PDF document text
    • https://lelopotive.weebly.com/uploads/1/3/0/7/130738546/2505287.pdfIn PDF document text
    • https://bilukejax.weebly.com/uploads/1/3/5/3/135392742/joxazamopa.pdfIn PDF document text
    • http://luminar3-download.xyz/pokemon_box_set_orderbq7s9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480414/normal_5fcb37aa0b83d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19C 5484 bytes
SHA-256: d05a53f23e5d02b2e8b8750e31713ffe34202aa2c8b16bc312ccbfd7583110a8
font_01_sfnt_off00010453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10453 10396 bytes
SHA-256: 6080eafd47d7f3023acaa7b468d2f578a7b8017db00f0561edecbd5165c7f642

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