Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b5cfac629dd4719…

MALICIOUS

PDF

75.2 KB Created: 2021-03-11 04:43:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 362ca803ac4705f388247d40ba763c94 SHA-1: d16353b74102b7f568a80709d0e83e87354c9b4e SHA-256: 1b5cfac629dd4719979a395029227736f36ae05fe85ab92ae78bcbfbacfda8fa
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm designed to host malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and heuristic firings point to a malicious document designed to redirect users to potentially harmful sites.

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-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://leonvi.ru/award?keyword=advanced+java+gui+tutorial+pdf
    • https://cdn.sqhk.co/butituguxur/ggzhbKm/7153127138.pdf
    • https://cdn.sqhk.co/damukowabij/jggcihX/laser_eye_color_change_costa_rica.pdf
    • https://cdn.sqhk.co/javepuju/HjhtnHs/filakepasulerezupim.pdf
    • https://cdn.sqhk.co/sazobenapur/cgdhiLu/73884633909.pdf
    • https://nefolebar.weebly.com/uploads/1/3/4/4/134400051/fedepufaso_xevaxo_poxuroduluveki.pdf
    • https://cdn.sqhk.co/bisuligiga/dQidghk/traditional_craftsmanship_solid_wood_furniture_increase.pdf
    • https://womominajarizu.weebly.com/uploads/1/3/5/3/135392323/banarexir.pdf
    • https://cdn-cms.f-static.net/uploads/4482190/normal_6017f6ea80944.pdf
    • https://static.s123-cdn-static.com/uploads/4367937/normal_5fe06162ec2d8.pdf
    • https://cdn.sqhk.co/feketukadoz/Fiisjhq/power_cord_awg_rating.pdf
    • https://cdn.sqhk.co/kosadara/a0gepjd/reverse_story_house.pdf
    • https://zawurufaxi.weebly.com/uploads/1/3/4/8/134861846/7557069.pdf
    • https://cdn-cms.f-static.net/uploads/4452217/normal_5fd94929e5511.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2eec0392-593e-4cb2-a279-c43f3944c8bc/radere.pdf
    • https://uploads.strikinglycdn.com/files/e7f32fd1-9597-43ce-a256-3dc0304f6baf/34132387928.pdf
    • https://uploads.strikinglycdn.com/files/bafb9ec2-c3d1-4f15-a24b-2d0e429f1662/why_does_my_sound_bar_skip.pdf
    • https://uploads.strikinglycdn.com/files/14c2e93a-804b-4273-bb6c-2d007088711c/how_to_write_a_childrens_book_for_beginners.pdf
    • https://uploads.strikinglycdn.com/files/e4f508be-2ce7-4f01-9303-e03779316dc0/how_to_remove_a_white_rodgers_thermostat.pdf
    • https://uploads.strikinglycdn.com/files/7e91760f-34f3-4654-9942-3c1a07340064/37777692384.pdf
    • https://uploads.strikinglycdn.com/files/48160817-0ec1-4506-9b2f-3330dec463f7/fl_studio_12_download_reddit.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb55.bin
b4d56f92fef2f771fdb22496c7c9b54cec1d6a03c97cfff91a77eb9a30b98106		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB55 5272 bytes
font_01_sfnt_off0000fd61.bin
3b1aafdbe20f1323e43539b61bd48f9abdc3a87d358db9bf8ba12bac7ef2d433		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD61 10104 bytes

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