Malicious PDF — malware analysis report

Static analysis result for SHA-256 3977384250f0717a…

MALICIOUS

PDF

83.4 KB Created: 2021-03-16 07:30:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43159b253da4085512ee374193be5e61 SHA-1: 455b85a5303a5486e28bc2ae8542e94ee2c93bb0 SHA-256: 3977384250f0717a9e25517acfb7f282ed5f9f1ebf5303e4ad3a48c273c7ca03
156 Risk Score

Malware Insights

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

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, suggesting a link farm or redirection mechanism to host malicious content. The document body, though heavily obfuscated, appears to be related to search terms for PDF downloads, indicating a lure to trick users into clicking malicious links.

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://druttle.ru/award?keyword=card+games+for+dummies+pdf+free+download
    • https://cdn-cms.f-static.net/uploads/4470019/normal_601e512503ba5.pdf
    • https://cdn.sqhk.co/godezixibufo/SjjMYie/the_office_quest_switch_walkthrough.pdf
    • https://cdn.sqhk.co/favosejo/fY1lnDi/bowling_western_suburbs_melbourne_demographics.pdf
    • https://cdn.sqhk.co/xeduwukaxusa/gg3hbhc/spirited_away_cast_japanese.pdf
    • https://gorixiboxizamo.weebly.com/uploads/1/3/4/5/134589430/e24647e5ffc1e.pdf
    • https://xivovawa.weebly.com/uploads/1/3/4/8/134875493/foleroxarufag.pdf
    • https://tikobivit.weebly.com/uploads/1/3/1/3/131382680/cb79a20c5.pdf
    • https://zugatuwedi.weebly.com/uploads/1/3/0/8/130874050/ladetuvifoj_gezijunufitop_kunorudez_palipunar.pdf
    • https://cdn-cms.f-static.net/uploads/4492900/normal_5fd807d2289a0.pdf
    • https://nokojuponamipi.weebly.com/uploads/1/3/4/8/134891784/lesakemafowaze_xukisujovoz_nefuxumote_zavizelivariv.pdf
    • https://cdn.sqhk.co/tejusukaxajo/9gi3zNf/photo_editor_free_download_for_pc_filehippo.pdf
    • https://cdn-cms.f-static.net/uploads/4410702/normal_5fd13fb57a9ee.pdf
    • https://cdn.sqhk.co/jutepoxof/jWqojjy/29417709186.pdf
    • https://cdn.sqhk.co/zoluwumenad/jdDompR/51912217996.pdf
    • https://bosudire.weebly.com/uploads/1/3/4/4/134456289/580872.pdf
    • https://xuxukiworizep.weebly.com/uploads/1/3/4/7/134723333/kadurolunopit.pdf
    • https://cdn.sqhk.co/jotepomi/cgeThid/air_tycoon_online_mod_apk.pdf
    • https://cdn.sqhk.co/kawurefeki/Oxicoue/icee_maker_for_sale.pdf
    • https://cdn.sqhk.co/tinolefowi/rhjiggf/41405457078.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/22648728-59ac-4a4b-ab23-44b51d1fd88c/legeliwoturixaxolu.pdf
    • https://uploads.strikinglycdn.com/files/775f40ea-769e-483f-832b-5c3080e296c3/what_does_ren_kou_mean_in_chinese.pdf
    • https://uploads.strikinglycdn.com/files/453fc6da-0626-493c-95fc-b110b7ea5103/zaturopojefuj.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_off0000fb9b.bin
0aa6ed3b12f76b9443dc91b91dd2f8e8f9d191619a8f656d4c78d575fd18ceeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9B 5280 bytes
font_01_sfnt_off00010d88.bin
f70e666af979ba9c57fe0520a0776a1da25809c9429342efe54a974c8bb6c088		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D88 10684 bytes
font_02_sfnt_off00013200.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13200 4324 bytes

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