Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2186b6dcc7ac244…

MALICIOUS

PDF

76.6 KB Created: 2021-03-10 08:41:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e448aba0e5017bea77c9e4bd132ea25d SHA-1: 5b26fc0c035b127bb257b51860705c045097cf97 SHA-256: f2186b6dcc7ac244e700964a36f5c59add9c453f73375f8e6d565df06de88311
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm designed to direct users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a malicious document, possibly leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/strik?utm_term=element+32+smart+tv+reviews PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4502248/normal_5fc88689e4bbe.pdfIn PDF document text
    • https://gatepeduvemixif.weebly.com/uploads/1/3/4/6/134669895/kifenotu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498868/normal_6026f2280f4ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448549/normal_5fc93a5f258d6.pdfIn PDF document text
    • https://forinuvu.weebly.com/uploads/1/3/4/8/134871535/tufomolaxakuzi_migotewe_fanusekirowivax.pdfIn PDF document text
    • https://pagejenaxupiwig.weebly.com/uploads/1/3/4/3/134383440/d156c086d08f.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/tosevud/merriam_dictionary_free_for_laptop.pdfIn PDF document text
    • https://c140f178-ee45-427e-91fe-a3c5f821f67e.filesusr.com/ugd/ebc5f9_9029f958b65f481e98f30e86e403823d.pdf?index=trueIn PDF document text
    • https://1a9cd40a-f0d6-44d4-a143-19288280ca2b.filesusr.com/ugd/7a13df_bc02a1173ddc42bea84873930498c01e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1545309e-3f42-481d-a3bf-544bb1f40d87/beats_solo_2_wireless_fix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ff1b855-fd22-4aaa-b638-4462cb6ad8d8/punjabi_grammar_book_class_5.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/vixojaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55eeea14-b497-4e78-8ae3-76ebf9faa016/how_to_understand_the_bible_more.pdfIn PDF document text
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_3df2b560c18e43d2a9f250dbebb0c88d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/15697684675.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a1958da-3543-4a01-961b-f0a1ffb989a1/taking_care_of_wife_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/gininefepineti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03bee589-6593-4d57-8d59-3694294032b5/mas_alla_del_principio_del_placer_freud_resumen_por_capitulos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fa74235-44e3-4142-bf7c-f63242f9f14b/14269525975.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f462cc5f-b28a-4466-b032-483f12f15a8a/how_tall_is_neil_degrasse_tyson.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_off0000f02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02B 5236 bytes
SHA-256: 6eb73968740df8158e59495ee85a937fabe6440d96f5d05183a67197df9d5887
font_01_sfnt_off000101f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F4 10356 bytes
SHA-256: 3cdb6dc2155e4d404280bbb9ea8303d85ed42c2d4bf8866f0d20dc0e5f5786be