Malicious PDF — malware analysis report

Static analysis result for SHA-256 e40b2f367ef229d6…

MALICIOUS

PDF

67.4 KB Created: 2021-03-30 14:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 400cc3fe97dcedd1c90c890f838c0d01 SHA-1: 580468285c1411149a473a3e6b7be802573181b0 SHA-256: e40b2f367ef229d643121fac076691ac4271af00de14e4338bd5cf84df336fbf
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URI pointing to 'zajinet.ru', disguised as a link to an audiobook. Numerous other suspicious URLs are also present, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URIs indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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=fifty+shades+trilogy+audiobook
    • https://cdn-cms.f-static.net/uploads/4380522/normal_604ecf322e3a7.pdf
    • http://sugameloxufe.mywebcommunity.org/110cc_pit_bike_semi_automatic_for_sale_uk.pdf
    • http://mevukavotidu.getenjoyment.net/vajusotobanefofolevo.pdf
    • https://static.s123-cdn-static.com/uploads/4451927/normal_5ffb0e2fb1272.pdf
    • https://static.s123-cdn-static.com/uploads/4377371/normal_5fde3ac45d169.pdf
    • https://cdn-cms.f-static.net/uploads/4474448/normal_603aea0cbdff1.pdf
    • http://file-id.ru/wisujejarululetolevofiw94km.pdf
    • http://ita-bio.fun/rorawuwumagajjnqhr.pdf
    • https://cdn-cms.f-static.net/uploads/4411923/normal_60107ed4ecc96.pdf
    • http://mojofaza.mypressonline.com/flowers_in_the_attic_full_movie_free_online.pdf
    • http://jinevul.mygamesonline.org/32725507737.pdf
    • http://topdiscount.pro/92773135215xwkin.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tikofaketonub/cv_europass_template_2019.pdf
    • https://s3.amazonaws.com/ragejufa/akshara_birthday_song.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_off0000cac4.bin
55fe5d0b61d002f4261a74bf71fdecf493b36d5d0f32d46df14431120d42cb5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC4 5428 bytes
font_01_sfnt_off0000dd48.bin
73ca0d2f43aaa0906e2596cfa0a206c2895c52c39e3425487b1b24f6ee1625d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD48 10400 bytes

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