Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f81c9a7391657f2…

MALICIOUS

PDF

87.3 KB Created: 2021-03-24 18:42:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7e01c1c28968941ca0817b5db7f715b SHA-1: 96a51bcf74eb2495cfaa6292129f1ee9cb82e759 SHA-256: 5f81c9a7391657f238d03d032ba138640b6083b8c2d04f3f91f3d2abb9852399
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 link farm, suggesting a phishing or SEO poisoning attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classified as Pdf.Phishing.Trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially malicious content hosted on external domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://maypoin.ru/wix?keyword=phet+balancing+chemical+equations+challenge+questions+answers
    • https://cdn-cms.f-static.net/uploads/4464874/normal_600f2fe048201.pdf
    • https://raligeledow.weebly.com/uploads/1/3/4/8/134893256/9e9d6fc.pdf
    • https://pexigupor.weebly.com/uploads/1/3/4/9/134901766/degulugeke.pdf
    • https://cdn.sqhk.co/sebuwemid/j4ghjhh/star_wars_rebels_season_4_episode_3_cast.pdf
    • https://cdn-cms.f-static.net/uploads/4500453/normal_60303e10ee58a.pdf
    • https://cdn-cms.f-static.net/uploads/4408993/normal_6030ccb407bbd.pdf
    • https://cdn-cms.f-static.net/uploads/4476294/normal_60142ff4a00c5.pdf
    • https://cdn-cms.f-static.net/uploads/4424666/normal_603034324eee5.pdf
    • https://cdn.sqhk.co/xotakuzazuf/pjdnrig/83292537178.pdf
    • https://cdn.sqhk.co/litigoruf/Riijaab/88611069621.pdf
    • https://mowexenasa.weebly.com/uploads/1/3/2/8/132815879/af5bc050b4a.pdf
    • https://cdn.sqhk.co/karadirimose/Q1id5ia/nekuzusotuvotulikedilazos.pdf
    • https://cdn.sqhk.co/zikufojigox/ggh0OvV/vande_mataram_full_video_song_free.pdf
    • https://cdn.sqhk.co/jarixizotib/hadq5hh/simsimi_dirty_version.pdf
    • https://cdn.sqhk.co/pukikojat/ZhZijBy/fun_things_to_do_in_downtown_seattle_washington.pdf
    • https://cdn.sqhk.co/ribegibonot/PUoPhjt/paris_texas_zip_code_map.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mokamoba/89068234015.pdf
    • https://s3.amazonaws.com/nisoxow/new_atm_card_request_format.pdf
    • https://s3.amazonaws.com/rixevozajixezos/backtrackit_pro_mod_apk.pdf
    • https://s3.amazonaws.com/xebuvuwov/35326690134.pdf
    • https://s3.amazonaws.com/medaliwifufugel/treasurer_s_report_excel_spreadsheet.pdf
    • https://s3.amazonaws.com/ritoma/heart_alone_pic.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_off00010d03.bin
b7f317aa0f29cd34df008dc84d8f376d2685882a57a4a5cd0d86477d0adf885a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D03 2828 bytes
font_01_sfnt_off000116fe.bin
043a10ad1d0428f8ad5001d55ec7e709709cb7f8966a5a114323fbc31727280c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116FE 5572 bytes
font_02_sfnt_off000129d4.bin
81469badbdd090def59ec7a34dbadd2000b94789e63736d87ad25592c4c0b5b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129D4 10808 bytes

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