Malicious PDF — malware analysis report

Static analysis result for SHA-256 291c41a48f052fc1…

MALICIOUS

PDF

77.8 KB Created: 2021-03-11 08:00:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 414f706568ff57b0a567da13db52d984 SHA-1: 793488f8d960feab7f697e7d5622985f9b72a031 SHA-256: 291c41a48f052fc102727ec68797e75834f82c7aeb0b50cac581b1023f3e0bb3
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF contains a large number of embedded links, many pointing to disposable hosting, indicating a link farm likely used for SEO manipulation or to distribute malware. One critical heuristic identified a link to known malicious redirector infrastructure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=revista+da+natura+em+pdf In PDF document text
    • https://wovugozota.weebly.com/uploads/1/3/2/6/132695813/2de80392928d2d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386839/normal_6035f1db43a61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385235/normal_6020390b4176a.pdfIn PDF document text
    • https://digeforoxega.weebly.com/uploads/1/3/4/6/134668277/koniwuxafog_fumixofawur.pdfIn PDF document text
    • http://pofaduxiruk.getenjoyment.net/kafumajo.pdfIn PDF document text
    • http://jofipifemu.medianewsonline.com/62558087661.pdfIn PDF document text
    • https://zulunapakaf.weebly.com/uploads/1/3/1/0/131070820/1354706.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368266/normal_600df81aa5444.pdfIn PDF document text
    • http://siwivelijutore.medianewsonline.com/30120640668.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426971/normal_5fddcc22c7819.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457861/normal_601bc54bcd06f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_4a3241f3984545a7a44660b30e5626f0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/how_to_play_mind_games_with_capricorn_man.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03f04a5a-7710-4049-bb13-6be017e46ffe/the_magicians_cast_season_1_episode_6.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/zokiradarex.pdfIn PDF document text
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_e1ac0e86dee94a0d8eb3748c9950edb9.pdf?index=trueIn PDF document text
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_3fa4c5855f174596bf9eb54428fca8e1.pdf?index=trueIn PDF document text
    • http://sinusudixuxuwad.atwebpages.com/begimogoruzemo.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/lakamazevatil.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/kusiboba.pdfIn PDF document text
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_ca3b48396f984e3abb766f2a8e56c643.pdf?index=trueIn PDF document text
    • http://netawuwimirixor.onlinewebshop.net/es_obligatoria_la_educacion_media_superior_en_mexico.pdfIn PDF document text
    • https://32b33340-d9da-4ef7-b3bd-a0ac5134eb71.filesusr.com/ugd/adfa6f_582c9e1e90a148fe9352668c9f080292.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bab28a9d-65a6-42e9-bac6-eac0aa96997b/difegilap.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/printable_maths_worksheets_year_10.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_off0000efa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA2 5224 bytes
SHA-256: c3765865caa8e9b59de0bde2eaccee38871b3d343ffb8b13a7489bbcc6e69f6a
font_01_sfnt_off0001015b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015B 12932 bytes
SHA-256: bfa9a91367a3ad6f9c8b152e05fd15d1b99823241c3098b1e88d661db0f95ad3

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