Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3c6e2ec788e41d0…

MALICIOUS

PDF

73.4 KB Created: 2021-03-31 23:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 756a0268c07d5f65267d11e6b62877cd SHA-1: b5e9d388d1e9e8223e2c6de34b3367859ed22382 SHA-256: d3c6e2ec788e41d04ae3c55816745ecba9629902f91b3d15a17efcd1ce76808f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, with one pointing to 'https://mezovuduw.ru/award?keyword=asthma+action+plan+pdf+texas', suggesting a phishing or link farm attack pattern. The presence of numerous external PDF links, some hosted on disposable domains, further supports this. No scripts were extracted, but the document structure and link farm heuristic point towards a malicious document designed to redirect users to harmful content.

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://mezovuduw.ru/award?keyword=asthma+action+plan+pdf+texas PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460723/normal_6052f63e306af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455183/normal_605355fa361b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424040/normal_5fd7f3f4b6ef6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375339/normal_5fd67dcace890.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379841/normal_60094547d2d59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476941/normal_601fc41ecb3ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408858/normal_6052c5d9b1983.pdfIn PDF document text
    • http://899themes-demo.ru/apollo_twin_solo_duo_differencegsmqa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448718/normal_5fed255413f67.pdfIn PDF document text
    • http://daimontimur.org/92972912116zix21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464070/normal_605fa9400a9ce.pdfIn PDF document text
    • http://buzevuzelape.mywebcommunity.org/zavuxalimap.pdfIn PDF document text
    • http://fitokaps.xyz/zajagawojoma4bk9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463266/normal_5fd68e6715de6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zatuvejamubolo.atwebpages.com/38630746929.pdfIn PDF document text
    • https://9f5bcc56-a059-4f00-ae85-604acd6a3d2d.filesusr.com/ugd/ac9354_4654e9bfb5ea414eaf721113069b044c.pdf?index=trueIn PDF document text
    • https://8df9d1b7-8f6e-49e1-bdac-c9da4d4291fd.filesusr.com/ugd/12c198_8126862cb2e54bd8bfcbcbdd0f934f12.pdf?index=trueIn PDF document text
    • https://e6e31949-ba74-43ae-8e0c-2243355e89fd.filesusr.com/ugd/69e259_d2b7e5d2dcc7425b84e2315fb2b83eca.pdf?index=trueIn PDF document text
    • http://wiwosotu.myartsonline.com/kokepizorojukew.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_off0000e2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BC 5356 bytes
SHA-256: 066b2a45a02c3f891938bc6fd5e196cbfb6219445ee60370dd5a8d8f64a302d1
font_01_sfnt_off0000f4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D9 10568 bytes
SHA-256: e11a75ea6f506abd16c8db99747c4054cd7f30ee6fb0659338b86dfe145ce9dd

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