Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6dd1d8441dd51ea…

MALICIOUS

PDF

78.9 KB Created: 2021-03-10 02:07:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7fa776ea0ef05f4b38b59a6774e63848 SHA-1: ef0a30de2c87a9bad074eb3ae34df9e0636e6ade SHA-256: f6dd1d8441dd51ea6778ca0cf7369534a8a96b25fd86d28af909a52525fa8256
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the PDF structure itself are indicative of techniques used to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wix?keyword=oracion+yo+pecador
    • https://cdn-cms.f-static.net/uploads/4406481/normal_6026a56e3bf53.pdf
    • https://cdn-cms.f-static.net/uploads/4424645/normal_601f2e0f0bdbf.pdf
    • https://cdn.sqhk.co/muxaferamet/2yE8StG/31770425546.pdf
    • https://cdn.sqhk.co/vatukaso/cvsOwb6/screen_recorder_for_pc_free_offline.pdf
    • https://cdn.sqhk.co/tosobulig/GKignjb/learning_numbers_for_kids.pdf
    • https://setibadumizokeg.weebly.com/uploads/1/3/4/8/134880372/4767436.pdf
    • https://cdn.sqhk.co/xonarewu/vyihihB/88217010713.pdf
    • https://pojekemo.weebly.com/uploads/1/3/4/4/134469054/2200516.pdf
    • http://vebifitapex.mypressonline.com/jurnal_bartolinitis.pdf
    • https://cdn-cms.f-static.net/uploads/4465257/normal_5fd3b33672d4c.pdf
    • http://desokore.medianewsonline.com/probability_problems_with_answers.pdf
    • https://cdn.sqhk.co/juxezijafoz/QPehemI/oliver_wood_wallpaper_phone.pdf
    • https://lutavazakagege.weebly.com/uploads/1/3/1/3/131398084/muvumesidutiw.pdf
    • https://cdn.sqhk.co/tevimuwijile/je2DYid/asmaul_husna_arab_latin.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1c3417ae-c208-4b2c-8381-5c1568c144cd/best_bookshelf_speakers_for_home_theater.pdf
    • https://uploads.strikinglycdn.com/files/64e02dae-bcc1-4050-b21f-4572e8511b5a/50598519240.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_off0000f635.bin
eb60ea3798939908d22046193adecd416b726cf160241cee665a1f0982a97af3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF635 4988 bytes
font_01_sfnt_off0001073e.bin
b0adf48c2675ac0bf011e2457a848a55590c7af93919bf2b68232a4e378a5202
pdf-font-stream PDF embedded font (sfnt) at offset 0x1073E 11704 bytes