Malicious PDF — malware analysis report

Static analysis result for SHA-256 78b85e536ebc98e5…

MALICIOUS

PDF

91.4 KB Created: 2021-03-10 13:26:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 663f02405b1bdaaeebd2fdc99d9d7526 SHA-1: 2744d1b8b685121cb80e7626126bd802da74a926 SHA-256: 78b85e536ebc98e583cd41adc09aa7a5e83f5280ddf912370c703f374981f1b0
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of an advance-fee scam. It contains numerous external links, with one pointing to a URL that appears to be part of a link farm designed to generate traffic or distribute further malicious content. The document body, though heavily obfuscated, contains keywords related to downloads and applications, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pelibifir.ru/wix?keyword=respawnable+apk+mod
    • https://cdn.sqhk.co/rojopuvukit/2btghyL/44450527704.pdf
    • https://dibovasejul.weebly.com/uploads/1/3/1/0/131070518/wunejikotimofi.pdf
    • https://cdn.sqhk.co/tevosudav/cofjdlR/telegram_download_link_bot.pdf
    • https://cdn.sqhk.co/purovufizu/ic4Yhab/wunaniloduwetavidego.pdf
    • https://wepuporo.weebly.com/uploads/1/3/2/7/132741302/3947512.pdf
    • https://sidamegudikeza.weebly.com/uploads/1/3/4/5/134585927/04bea3e1.pdf
    • https://xoselobukakuri.weebly.com/uploads/1/3/4/4/134498653/a0762fa.pdf
    • https://fukidupedogof.weebly.com/uploads/1/3/2/8/132814182/nodukagugasekex_kamarenesiri_wuguruxij_jenixikoz.pdf
    • https://cdn.sqhk.co/wukikanas/hle4gix/real_moto_2019_raha.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://tobidogajetu.onlinewebshop.net/46442427163.pdf
    • https://s3.amazonaws.com/supefujoxopubu/how_to_unfreeze_ge_ice_maker_water_line.pdf
    • https://s3.amazonaws.com/vavale/math_addition_doubles_worksheet.pdf
    • https://s3.amazonaws.com/fazujo/32844286868.pdf
    • https://s3.amazonaws.com/xalexojaxipud/karthika_deepam_serial_heroes.pdf
    • https://s3.amazonaws.com/nakevoja/website_design_template_size.pdf
    • https://s3.amazonaws.com/budovewesekaz/59182540919.pdf
    • http://palelezugob.onlinewebshop.net/role_du_liquide_amniotique.pdf
    • http://subogerilazelo.atwebpages.com/vimokukaluzebuduveguwamu.pdf
    • https://s3.amazonaws.com/lulelepese/67877406029.pdf
    • https://s3.amazonaws.com/tobito/gasetiw.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001084d.bin
eb235989bc561c9e953c3a7ed3daebd429c0d20e8c85a33c70480fe7fb3ef724		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1084D 4972 bytes
font_01_sfnt_off00011927.bin
bb5c77b0efd349f2208bb8477ed812cee83bfb7fdd43a72727e27ede75796f44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11927 10364 bytes
font_02_sfnt_off00013cd9.bin
6bd6cda04696584186cf1917ebb65d70a28576a2cf09a71ff67a2fb08a026c5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD9 16136 bytes
font_03_sfnt_off000151dd.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x151DD 4324 bytes

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