Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d74e114fdae804d…

MALICIOUS

PDF

79.6 KB Created: 2021-03-24 04:57:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: cb88ab7c37aa7b617bb4efbdfa62e981 SHA-1: cd0872f5582cc5b10d5e81cffb3df3c8b3c30a02 SHA-256: 3d74e114fdae804d7362e5a31478b44868912fc3214a140b3754d449a416cdf5
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of an SEO link farm designed to redirect users. The primary redirector URL, https://seumenha.ru/123?utm_term=samsung+mobile+themes+app+free, is used in conjunction with an image lure, suggesting a phishing or scam attempt to trick users into downloading further content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • 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/123?utm_term=samsung+mobile+themes+app+free PDF link annotation
    • http://bamovewube.22web.org/munchkin_rules_death.pdfIn PDF document text
    • https://cdn.sqhk.co/ragojagef/wSicjim/jirugosatomijulisexetoj.pdfIn PDF document text
    • http://reguvixelupuj.iblogger.org/is_it_okay_to_workout_if_you_have_scoliosis.pdfIn PDF document text
    • http://xofutumokegabix.22web.org/markstrat_report.pdfIn PDF document text
    • https://cdn.sqhk.co/japexexuko/bgcjcIR/corporate_governance_guidelines_malaysia.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://72dfff08-f6cb-4f5d-aaac-ebe71175d6a6.filesusr.com/ugd/c268f7_6f0fa968d2af446d865a994a768f3ffd.pdf?index=trueIn PDF document text
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_996e2d38fc8f4be5ae76ebdb51bbf841.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/penale/lunadogemeximanezasilago.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/car_insurance_ielts_listening_answer_section_2.pdfIn PDF document text
    • https://b7af6bb9-01eb-4839-ab56-764651de4344.filesusr.com/ugd/2486b5_c2d55469832e4a93b29d1221a6463dba.pdf?index=trueIn PDF document text
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_23cd2a4edbad42898293e5fa03bf553f.pdf?index=trueIn PDF document text
    • https://c96d0889-97fb-4213-90a4-a08ae01970e6.filesusr.com/ugd/ed32f2_93c6a9c1132c44b08a430b396daefa89.pdf?index=trueIn PDF document text
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_6a3d498ed035416b8bd5c1718a9521b7.pdf?index=trueIn PDF document text
    • https://fea67d75-dd3b-4bdd-af05-748e92ec8a52.filesusr.com/ugd/05900a_fa8025fe82a148eea1d7dfcb2339cc9b.pdf?index=trueIn PDF document text
    • https://11627308-8c8f-4f08-99ed-0ad85160907d.filesusr.com/ugd/682d1c_3264f4b1383e44929cc1c0f2e3658c77.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gebukil/antibiotik_ampicillin.pdfIn PDF document text
    • http://zozemuki.rf.gd/22258969113.pdfIn PDF document text
    • https://52a72965-a6d2-471e-b66a-59a59a4d663b.filesusr.com/ugd/e643da_887e896872b34c8dabfd30ee7e5f97ff.pdf?index=trueIn PDF document text
    • https://8a5a474a-a671-4857-921d-d1df0ee72544.filesusr.com/ugd/523716_e888aa6a135c4d96bc992575ac7f143a.pdf?index=trueIn PDF document text
    • https://a819be37-316e-4347-83bc-b067fb6953c8.filesusr.com/ugd/d5662a_fe56a742469340de8076c63dcd17920a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/medicare_benefit_policy_manual_chapter_1_section_110.1.2.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/lebipi.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_off0000eabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABB 5440 bytes
SHA-256: 184c1f5517525d79b0e57bd58d860a59d8385fe48e5291d2aff0b1e4e49ed6cb
font_01_sfnt_off0000fd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD03 11064 bytes
SHA-256: 01b35cdefbcdafbd41266db6788333fb9902df30c19ab70f210bf487cd9a7a73
font_02_sfnt_off000122f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F2 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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