Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb87866414b44aff…

MALICIOUS

PDF

77.0 KB Created: 2021-01-12 06:26:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 235dbb68da632d4f39f414485f328e13 SHA-1: 11a5f62b569818b0e5900b918ec05e533c530941 SHA-256: fb87866414b44aff874fd907da8423edd968976dca9d5a2eff84dc17be70b1c1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document's content, though heavily obfuscated, appears to be a lure for downloading files, as suggested by the URL and heuristic findings related to link farms and disposable hosting. The presence of numerous external URIs points towards an attempt to redirect the user to malicious content or download further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafffi.ru/123?utm_term=crsi+manual+of+standard+practice+pdf+free+download PDF link annotation
    • https://site-1178084.mozfiles.com/files/1178084/miwovigov.pdfIn PDF document text
    • https://site-1172077.mozfiles.com/files/1172077/mataxivumafu.pdfIn PDF document text
    • https://cdn.sqhk.co/takodabu/hdgguia/download_piano_magic_tiles_3_mod_apk_ios.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426823/normal_5fda18b57940b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417525/normal_5fe59c917e3ff.pdfIn PDF document text
    • https://givifajilodox.weebly.com/uploads/1/3/0/8/130874655/5008175.pdfIn PDF document text
    • https://site-1180216.mozfiles.com/files/1180216/ninjago_castle_lego.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379476/normal_5f9377df253bd.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/4867245.pdfIn PDF document text
    • https://site-1171785.mozfiles.com/files/1171785/alien_vs_human_game_y8.pdfIn PDF document text
    • https://botubadixebom.weebly.com/uploads/1/3/1/4/131407995/vikeluj_fogezuride_defalisuxuzi_bepumosub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447466/normal_5feb1e901784c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD846 5296 bytes
SHA-256: c6d0d5d9226bb7628c9fa35ecb876c7cf605ce9c516525e15f765461832b110a
font_01_sfnt_off0000ea3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3D 11784 bytes
SHA-256: e50779e3d97d47190fa85adb5918cb1492d2909ecda18f9737e79199149ef974
font_02_sfnt_off00011165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11165 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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