Malicious PDF — malware analysis report

Static analysis result for SHA-256 35eea72f96e8aa19…

MALICIOUS

PDF

75.7 KB Created: 2021-04-15 11:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35db7f7eb4d19062addee01f54bb8dc2 SHA-1: b8dfaa1b6931fb90f7666751259c17e1b7484af0 SHA-256: 35eea72f96e8aa1980cfda2227f1b3b10d7de333c4e3cfa7afdc92a05ba48fcb
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, including a link farm heuristic firing, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing and trojan activity. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a common phishing or malware distribution technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=printable+math+worksheets+simple+addition
    • https://cdn.sqhk.co/zelosoza/iajdd9t/61478517978.pdf
    • https://cdn-cms.f-static.net/uploads/4369323/normal_5fdbff28c6eb2.pdf
    • http://springwin.space/kylo_nifi_templatesysjbs.pdf
    • https://cdn.sqhk.co/godezixibufo/9gdxamL/3d_for_knowledge_base_for_wot.pdf
    • http://afracheat9.xyz/jodorigividoriwudilebu48k7i.pdf
    • https://cdn.sqhk.co/xipitufekaru/xihjbgc/guvezozitokusakezulojov.pdf
    • https://static.s123-cdn-static.com/uploads/4409093/normal_5fcd991e4c9a1.pdf
    • https://static.s123-cdn-static.com/uploads/4447276/normal_5fcb04ace165b.pdf
    • https://cdn.sqhk.co/lebudawojafi/cghi2GS/slot_games_that_give_real_money.pdf
    • https://static.s123-cdn-static.com/uploads/4388596/normal_5fff332f69c82.pdf
    • http://hangookoil.ru/57051540175o4spa.pdf
    • https://cdn-cms.f-static.net/uploads/4379483/normal_602d7e3aa9c91.pdf
    • https://debosuvulodek.weebly.com/uploads/1/3/1/0/131071041/7c1ac67.pdf
    • https://gubulugovidenu.weebly.com/uploads/1/3/1/4/131406252/taguvatux.pdf
    • https://cdn.sqhk.co/numokafas/mbhfFxg/stickman_troll_face_ragdoll_editor_online.pdf
    • https://pawimugonuri.weebly.com/uploads/1/3/4/8/134882006/kobexi-votegedido-gowazavasiwof-poxeripor.pdf
    • https://cdn.sqhk.co/biwezabob/sgi6xAP/74961049443.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/muvazi/adobe_premiere_pro_2021_new_features.pdf
    • https://s3.amazonaws.com/metakibeme/clifford_the_big_red_dog_story.pdf
    • https://s3.amazonaws.com/vonusirukete/fe_exam_prep_course_san_diego.pdf
    • https://s3.amazonaws.com/foneniz/zabovi.pdf
    • https://s3.amazonaws.com/baxunaf/mudab.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e42e.bin
bff1d257aea7eec1c7b25878f14209e36e977cc9aa8b412379c9753adc25ef7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE42E 5496 bytes
font_01_sfnt_off0000f6bb.bin
65de16f64193c33ee90bd03e050f3d86f72f9d95f674800e06273108e75badd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BB 13220 bytes

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