Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4dec86499302245…

MALICIOUS

PDF

98.9 KB Created: 2021-03-18 02:02:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01e9ae568545a519461e8b8bc2242c83 SHA-1: 10986933744eb074db7f2f6cf1b8711abd695be0 SHA-256: b4dec86499302245149cc00158d8f0035934be42d5832c51c960ad347b2acf86
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 as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML score further support malicious intent. While no scripts were directly extracted, the embedded URLs are the primary indicators of compromise, likely leading to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/award?keyword=creative+writing+for+dummies+pdf+download
    • https://cdn.sqhk.co/vekuperik/ehesSii/wodugu.pdf
    • https://cdn.sqhk.co/dutaxato/zjjjihu/extended_weather_forecast_for_atlanta_michigan.pdf
    • https://static.s123-cdn-static.com/uploads/4476146/normal_5ff2735b29264.pdf
    • https://jukirabupunux.weebly.com/uploads/1/3/0/8/130874410/66a21.pdf
    • https://cdn.sqhk.co/fegukajebaj/dgjEh5W/82645253906.pdf
    • https://cdn.sqhk.co/tezofugowura/2W3qhg8/red_ball_game_online.pdf
    • https://nazesamujev.weebly.com/uploads/1/3/1/3/131397942/e9ecde.pdf
    • https://cdn.sqhk.co/dufikibagi/7nbieDy/bipekutinaxapotuxemiragel.pdf
    • https://cdn-cms.f-static.net/uploads/4414852/normal_602f608cdcf58.pdf
    • https://cdn.sqhk.co/nupumusu/fljajjW/anime_face_maker_go_mod_apk.pdf
    • https://cdn.sqhk.co/dagozuwemep/hdTzhbv/tokaganefilixafobezavav.pdf
    • https://cdn.sqhk.co/noluxokeruma/dhijlhf/ticket_to_ride_europe_board_game_geek.pdf
    • https://cdn.sqhk.co/kavuweduti/cDiaijL/42685844384.pdf
    • https://cdn.sqhk.co/mitebosareki/idgf0ge/ghost_ant_bait_home_depot.pdf
    • https://cdn.sqhk.co/puvubuzu/8FuhUiJ/49301866273.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tiluwisulepam/fender_twin_reverb_reissue_used.pdf
    • https://s3.amazonaws.com/wefadep/38800117828.pdf
    • https://s3.amazonaws.com/napejaxosinages/allan_quatermain_free.pdf
    • https://s3.amazonaws.com/gajakelegeza/kurivelatovepokifizanisem.pdf
    • https://s3.amazonaws.com/dinigugaxej/28269579039.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_off00013723.bin
a62e55873ec3c475118fdbbd4f2429b18612fb1fbcb97b773aada68d2f760e88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13723 5420 bytes
font_01_sfnt_off00014988.bin
9078af3100bd9f5cec04c9dddb0449a19d8bd1204446def0047a277061bac212		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14988 2856 bytes
font_02_sfnt_off000155aa.bin
7868c77aa427ede1f437d748a48017e9021043dee5310c20bbd2be807052aa83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x155AA 11708 bytes

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