Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5d0f37bd1a78409…

MALICIOUS

PDF

80.5 KB Created: 2021-03-18 20:26:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1421876d5ac1df60363df1bd2b818f83 SHA-1: b43861034eefb3f00d275fb2156808bc56e7eea9 SHA-256: f5d0f37bd1a78409055a162138cde8040f542207efe5d344bc6494164e1ad6cf
136 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded URI and a high-severity heuristic firing for an image lure linking to an SEO redirector, specifically 'https://seumenha.ru/strik?utm_term=how+to+read+a+book+fast+wikihow'. This suggests the document's primary purpose is to trick users into visiting a malicious site. No scripts were extracted, but the PDF structure and embedded URL are strong indicators of a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://seumenha.ru/strik?utm_term=how+to+read+a+book+fast+wikihow PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464534/normal_6034f23440989.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482848/normal_5fcfea5a01390.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383918/normal_600cfcb1abfcb.pdfIn PDF document text
    • http://gejesixave.scienceontheweb.net/jimurudoluxotobudisamak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380675/normal_5fe4d7003e671.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404103/normal_604e47828ac7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480397/normal_5fd7cf5885190.pdfIn PDF document text
    • http://dusikazo.mypressonline.com/5421437426.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482872/normal_60373754a90a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474992/normal_604cc75f38db0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/naxozelozude/90383170648.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87ed0188-bf5d-4d3d-9db7-bc38872453bf/55006894629.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/692e12e3-cebe-4207-85e4-1c9e00e13c85/guess_how_much_i_love_you_fabric_cloth_works.pdfIn PDF document text
    • https://s3.amazonaws.com/farokof/jigegaranutanalib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ab10e8e-1bf3-44b4-9ea5-428d33e2141d/gudedikopawowexudajiji.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/idsa_guidelines_for_complicated_urinary_tract_infection.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c0477b2-fa00-4ba4-8344-b4c6500964b8/renag.pdfIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/artificial_intelligence_books_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f996c46-977b-44a7-9407-90947204cb57/peace_like_a_river_love_like_a_mountain_guitar_chords.pdfIn PDF document text
    • http://sidepojedava.myartsonline.com/marine_corps_physical_fitness_program_mco.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0073d80d-ad21-4f6d-8970-26c381a32eca/what_does_the_flashing_red_light_on_my_furnace_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed3ffc54-7f49-4c79-b6bf-a3fa5d3df190/35430941512.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/lista_verbos_irregulares_ingles_traduccion_espaol.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF50 4904 bytes
SHA-256: c7f0b2b6887d1748aae13533da14cfad3f1b00d4fe73bf744c5404ee5d3d43c8
font_01_sfnt_off0001001a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001A 11392 bytes
SHA-256: d34e25ab3e9163fa4609b794fa628a410338e8e79a867c40747587f3cc78ab96
font_02_sfnt_off0001266d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266D 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3