Malicious PDF — malware analysis report

Static analysis result for SHA-256 067a93cc53871177…

MALICIOUS

PDF

81.8 KB Created: 2021-05-14 14:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8b0cdd9abef417a24fc57e9c17ee328 SHA-1: e5fac76b2fd7267c6684d5bee0698a3727befac2 SHA-256: 067a93cc53871177f31bfd96079fe8b600fde7c98c82c0cfe28e0272b8294b86
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, with one prominent URL pointing to 'dafemum.ru' which is associated with a phishing lure regarding 'dish network' updates. The PDF structure and the presence of external URIs suggest it's designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://dafemum.ru/strik?utm_term=how+to+update+guide+on+dish+network PDF link annotation
    • https://mejefarekobuk.weebly.com/uploads/1/3/4/3/134338461/ba5575ebc4b.pdfIn PDF document text
    • http://dasiwujupuna.sportsontheweb.net/super_mario_land_3_super_nintendo.pdfIn PDF document text
    • https://vefarekosisag.weebly.com/uploads/1/3/4/7/134722728/3bc2167a223.pdfIn PDF document text
    • https://kibodoru.weebly.com/uploads/1/3/2/6/132695707/bakazure.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466679/normal_603d8a604d4e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467586/normal_6039d95ed4843.pdfIn PDF document text
    • http://likedizar.medianewsonline.com/das_wunder_von_bern_doping.pdfIn PDF document text
    • http://nakalabaxis.mywebcommunity.org/38227216282.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405660/normal_600262f4a7e03.pdfIn PDF document text
    • http://vobuxunulorepi.22web.org/libosuwulafewanimelo.pdfIn PDF document text
    • https://kukatuvitakutir.weebly.com/uploads/1/3/4/6/134690336/4678532.pdfIn PDF document text
    • https://xepawonim.weebly.com/uploads/1/3/0/7/130776577/3099d97.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vulitogegitutop.rf.gd/bhutanese_song_2018.pdfIn PDF document text
    • http://jiwodiw.myartsonline.com/callese_y_venda_download.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/18918324513.pdfIn PDF document text
    • http://dakafatuvuguviz.atwebpages.com/fafibun.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/dufokozigitejumi.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/duroxonojafaxawebazik.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe2b.bin
4eee774c74669ed9e5bcce2d1106b1d16547c345e69a2ff4d6be19b77a11e42e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2B 5304 bytes
font_01_sfnt_off00011042.bin
b4dc25199f9326b4412d1f2654595b95e7d6029eb98b243d2dccef6218ccb8fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11042 12152 bytes

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