Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d4a74b3f4b2907c…

MALICIOUS

PDF

78.3 KB Created: 2021-03-28 00:42:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17a095157cd279f8734e2c905a0091ac SHA-1: 2aaf7bee227d1368f484fe61d3623b15b0e39210 SHA-256: 5d4a74b3f4b2907c186fbdefad7c71cc48dc9e9ccfe23368e0efe94ecf367cab
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, and is flagged by ClamAV as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to international mail addressing. The presence of multiple external URLs indicates an attempt to redirect the user to malicious sites, likely for phishing or malware distribution.

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://xezojetit.ru/strik?utm_term=how+to+write+address+international+mail
    • https://cdn.sqhk.co/wepurodapike/haMigjd/jumbline_2_word_solver.pdf
    • https://fibimijisu.weebly.com/uploads/1/3/4/4/134461798/litiwibepebula_vevotipakafijeg_palobidaw_noravufizered.pdf
    • https://cdn.sqhk.co/wozulifudon/YFiaL6L/new_odia_film_blackmail_video_song.pdf
    • https://cdn.sqhk.co/sugezigo/gfgcujf/70155078223.pdf
    • https://vexifodukegaze.weebly.com/uploads/1/3/5/9/135977609/lukom-suwafir.pdf
    • https://cdn.sqhk.co/xusarukave/gdrqeih/price_of_copper_wire_per_pound_in_california.pdf
    • https://cdn.sqhk.co/xuluriwu/LhdUZG8/77216446976.pdf
    • https://cdn.sqhk.co/sogunixe/cgeL7gd/49408335035.pdf
    • http://hookup153.site/sports_team_baseball_hangaroo06mih.pdf
    • https://cdn.sqhk.co/bujomuvi/iUugjhc/traditional_italian_music_remix.pdf
    • https://sikiroradimer.weebly.com/uploads/1/3/4/6/134619363/5e1b38d9aeb1d.pdf
    • https://bunogijadijis.weebly.com/uploads/1/3/4/8/134896562/jonegivubowimarov.pdf
    • https://temetufel.weebly.com/uploads/1/3/1/8/131856903/vebusodutezisam_gorevabeleregik_jebaga.pdf
    • https://bawokopo.weebly.com/uploads/1/3/1/0/131070727/xufisevok_zeparo.pdf
    • https://cdn.sqhk.co/wuwosexed/fWN13YG/37740475334.pdf
    • http://sallehub.xyz/polaroid_one_600_classic_kamera_filmh3ndb.pdf
    • https://cdn.sqhk.co/leluforeref/xDjajbX/wogulixobiberifoponileju.pdf
    • https://cdn.sqhk.co/xugosovemi/aHSh8id/24769413821.pdf
    • https://nugilura.weebly.com/uploads/1/3/5/3/135317706/dipenevegat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://75ca6b5e-a470-4e0e-8004-b00a9f1721b4.filesusr.com/ugd/1e4819_947f26b52bda446d922fc008a0456289.pdf?index=true
    • https://874c0fd6-92eb-497b-905f-dc7ca4d2e287.filesusr.com/ugd/5ca7d4_80fa21c3c0974637a1f39f9c7cd810db.pdf?index=true
    • 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_off0000e884.bin
c6e877a62d553eb07e93189782e743f43efa8974480260159ec5f6b50b8b4973		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE884 4812 bytes
font_01_sfnt_off0000f8c5.bin
dc1bc7365f5960bc221b2fe613d7f1ffceb5996e107f565b91270046475335e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C5 10840 bytes
font_02_sfnt_off00011dc3.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC3 4324 bytes

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