Malicious PDF — malware analysis report

Static analysis result for SHA-256 b165b64f1ed53b0f…

MALICIOUS

PDF

113.7 KB Created: 2021-05-18 06:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f332d0c50801cfb2d352d2d919a8f10a SHA-1: 5c1d78aaa809134de6b45ae9866b6f39a7c19d09 SHA-256: b165b64f1ed53b0fcd49f5f2e9728871823a23aceb7f95f26d02d141742b5917
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to potentially malicious domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful websites.

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://botokaw.ru/strik?utm_term=abnormal+psychology+notes+pdf
    • https://nupepapuk.weebly.com/uploads/1/3/1/4/131484133/81582.pdf
    • https://gowumobajakexe.weebly.com/uploads/1/3/4/5/134585768/d637da76.pdf
    • https://cdn-cms.f-static.net/uploads/4490251/normal_601248381961a.pdf
    • https://jelonuzekuxenu.weebly.com/uploads/1/3/2/8/132814084/fumusigikixol-xibonevim-kexumerad.pdf
    • https://xunumiselodaz.weebly.com/uploads/1/3/0/7/130775676/dinaxa.pdf
    • https://rezilatepupegox.weebly.com/uploads/1/3/5/3/135318796/popokenaxumu.pdf
    • https://cdn-cms.f-static.net/uploads/4473903/normal_606626b0c3b19.pdf
    • https://pedexanagokol.weebly.com/uploads/1/3/4/6/134635549/46393429.pdf
    • https://static.s123-cdn-static.com/uploads/4406456/normal_6000ecd7d542d.pdf
    • http://wowoxeje.22web.org/palezu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://zegeridibedile.rf.gd/piano_sheet_music_hallelujah_leonard_cohen_free.pdf
    • http://futerubewubevu.epizy.com/ipod_classic_30gb.pdf
    • http://fawivemepogu.epizy.com/60084868052.pdf
    • http://bosabesebomixeb.epizy.com/ssc_stenographer_book_in_english.pdf
    • http://vuzinibijabu.rf.gd/bituthene_3000.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001721b.bin
acf5f5e655a45236475b5f7fc99ba9fee8d33ae7fa77e0802d659243014fae04
pdf-font-stream PDF embedded font (sfnt) at offset 0x1721B 5540 bytes
font_01_sfnt_off000184b5.bin
863c5e6120ea9cf64b37347a1e0d288018f59e9607c94a6f356faf0a506747ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x184B5 11732 bytes
font_02_sfnt_off0001ab77.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB77 4324 bytes