Malicious PDF — malware analysis report

Static analysis result for SHA-256 8975396fba1beed2…

MALICIOUS

PDF

84.3 KB Created: 2021-06-03 13:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 12094338bb93484c0ca36cef0bd697e8 SHA-1: 5b926c9efe4d297ccf37067a3ebb1d0fbe38cae1 SHA-256: 8975396fba1beed2e16f953f95228a81627132a2d9e09bbca3baa92bdecf781b
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 other PDFs, indicating a link farm designed for SEO manipulation or to distribute potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, classifying it as Pdf.Phishing.Trojan. No scripts were extracted, but the presence of numerous external links and the high confidence verdict point towards a phishing or malware distribution vector.

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://lozipotod.ru/123?utm_term=spider+man+first+comic+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4412396/normal_5fcc6f8695d3c.pdfIn PDF document text
    • https://nurojitare.weebly.com/uploads/1/3/2/6/132682966/5202086.pdfIn PDF document text
    • https://lixebofupasiwik.weebly.com/uploads/1/3/2/3/132303312/faziruga-mufirosew-zumatot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446034/normal_60568d6f830f8.pdfIn PDF document text
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/gipomowojiku-sazer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389384/normal_603df87801d8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406456/normal_6041cfc22c7bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445325/normal_606e6f71848af.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/43171b28-0863-4141-9cfa-0238e7026434/how_to_use_a_4_step_buttonhole_foot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d9b2376-aa20-4029-b36a-77d5e897f3dc/why_chant_rudram.pdfIn PDF document text
    • http://kepigiwup.pbworks.com/w/file/fetch/144500577/8336837965.pdfIn PDF document text
    • http://tukufidanega.pbworks.com/f/vuzewafaketilinopizel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daaca7ba-4d59-40fc-9105-26b775258bd5/72202546975.pdfIn PDF document text
    • http://vulazojab.pbworks.com/w/file/fetch/144546336/lanosozuxamiwopusopog.pdfIn PDF document text
    • http://gogoporiwo.pbworks.com/f/is_spongebob_getting_cancelled_in_2020.pdfIn PDF document text
    • http://sonopewobu.pbworks.com/f/jim_raman_cause_of_death.pdfIn PDF document text
    • http://liwuvedesisu.pbworks.com/w/file/fetch/144496563/teorema_de_bayes_calculadora_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56d0ffe2-820c-4dd0-a0a6-f6c4d8aa4a6b/rope_hero_vice_town_download_softonic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e18ec343-2b3b-4ef5-ab24-b3a75625fc8a/66067577596.pdfIn PDF document text
    • http://dimutojopog.pbworks.com/w/file/fetch/144474510/how_to_unfold_nordictrack_a2105_treadmill.pdfIn PDF document text
    • http://jopamedet.pbworks.com/w/file/fetch/144479781/what_is_the_rhyme_scheme_of_a_sonnet.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_off00010c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C88 5372 bytes
SHA-256: 8073c2b936c4cb44a9732d2e9ca28e6f76d5e6dc797cc84fc484e55da6c07018
font_01_sfnt_off00011eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB4 11012 bytes
SHA-256: 87106a73891f18bc2f5cea475502a830c35aae74fad65f378b7713d8d768d9ec