Malicious PDF — malware analysis report

Static analysis result for SHA-256 f12cbff082fbab7a…

MALICIOUS

PDF

89.8 KB Created: 2021-04-08 17:20:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0db73ed436ffa5a1fd7dfc7bf50e1a65 SHA-1: ebfe05ddc089640841acd7bd2d047c1c6fd9fc7c SHA-256: f12cbff082fbab7a89ec95bf90e9f0a63494d5b4717e1a39bc9f86e15d31580b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier also indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/strik?utm_term=the+choice+summary+nicholas+sparks
    • https://samaruwopag.weebly.com/uploads/1/3/0/7/130738554/9968559.pdf
    • http://devgm.design/nebizobomemojegubejobopo64d5x.pdf
    • https://wudajelenap.weebly.com/uploads/1/3/4/4/134470879/ranonipitapijir_wowakato.pdf
    • https://defupodanujazi.weebly.com/uploads/1/3/5/3/135346118/xabigijufuj.pdf
    • http://profyhouse.ru/fewepebewapetojufaputejenuz2q.pdf
    • http://itdiscount.info/tutafikalohwyze.pdf
    • https://pinozawekik.weebly.com/uploads/1/3/4/5/134589254/wawofogevade.pdf
    • http://chambrehub.xyz/59729181081pmgmp.pdf
    • https://kitabenulo.weebly.com/uploads/1/3/0/9/130969432/4166942.pdf
    • http://pitushok.fun/7271519422554na3.pdf
    • http://useporte.xyz/how_to_use_husky_175_psi_air_compressorh0kvm.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/sogovekevi/the_magic_rhonda_byrne_barnes_and_noble.pdf
    • https://s3.amazonaws.com/xupimaral/estudio_biblico_la_oracion_del_padre_nuestro.pdf
    • https://uploads.strikinglycdn.com/files/27a3a5c0-19f9-4522-b8cb-703be01ac53b/zixugab.pdf
    • https://s3.amazonaws.com/dipafuxe/jadomurim.pdf
    • https://s3.amazonaws.com/pusori/vinonogevolituxofawobuze.pdf
    • https://uploads.strikinglycdn.com/files/012d9750-55a2-4056-b2c1-a874386619ac/tojawababogu.pdf
    • https://s3.amazonaws.com/nodetuxapabara/ecosystem_biotic_and_abiotic_factors_worksheet.pdf
    • https://s3.amazonaws.com/woxojuxafopuv/30_day_diabetes_cure_recipes.pdf
    • https://s3.amazonaws.com/jirebonudur/making_inferences_worksheet_high_school.pdf
    • https://s3.amazonaws.com/mexavofezoxi/geographical_information_system_courses_in_india.pdf
    • https://s3.amazonaws.com/kizugokofo/zoxakuretegumezeretikal.pdf
    • https://s3.amazonaws.com/tinezedu/pixukisuwokikuzukes.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fea3.bin
2d1bd230509f7dec72ab4605782d414d689ea808def873df42c5a790a5f4da7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA3 5092 bytes
font_01_sfnt_off00010fbf.bin
0a039a5be7913d7ad1863cfb4f96c769a275daa280d0b91526920e6d21a4b148		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBF 10776 bytes
font_02_sfnt_off000134bd.bin
e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134BD 16092 bytes
font_03_sfnt_off00014985.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14985 4324 bytes

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