Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3449ffdd13223b0…

MALICIOUS

PDF

91.9 KB Created: 2021-03-15 12:26:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: cefefb6b0b2c35bf813b09ba66543ed0 SHA-1: cbe6692b1339baf6a8b45e6fdc14830edbbd9c00 SHA-256: c3449ffdd13223b03084f5dc1b847be02e66b5b37deab1be574c2b22977b8537
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://soxebez.ru/123?utm_term=tangent+and+cotangent+graphing+activity+answers PDF link annotation
    • https://cdn.sqhk.co/kerutadit/ihP3Hjh/music_avee_player_pro_paid_mp3_player_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/kubarevopew/hDnjjgh/pepedi.pdfIn PDF document text
    • https://toroxamaje.weebly.com/uploads/1/3/4/0/134017611/7499738.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/jcaIjgf/your_guide_world_travel_tour_guides.pdfIn PDF document text
    • https://cdn.sqhk.co/tomubozes/dhgS1hj/kabetidojovumajizuje.pdfIn PDF document text
    • https://komanogorolelew.weebly.com/uploads/1/3/1/3/131380356/wumobediretevuxa.pdfIn PDF document text
    • https://fenawivo.weebly.com/uploads/1/3/4/0/134000055/8cd8630.pdfIn PDF document text
    • https://jupavovol.weebly.com/uploads/1/3/4/3/134314217/97be0333fd89e.pdfIn PDF document text
    • https://moxamegok.weebly.com/uploads/1/3/3/9/133999551/2681a2.pdfIn PDF document text
    • https://lagomide.weebly.com/uploads/1/3/5/3/135304015/2869946.pdfIn PDF document text
    • https://cdn.sqhk.co/kibizatududo/hjDxihi/zarubuvagorodesefonawiz.pdfIn PDF document text
    • https://cdn.sqhk.co/xegunorasu/hegg4na/rolling_sky_music_illusion.pdfIn PDF document text
    • https://guvepilafofifiv.weebly.com/uploads/1/3/4/6/134682232/8095850.pdfIn PDF document text
    • https://kobokudebixisog.weebly.com/uploads/1/3/5/3/135390699/navusekabilewezalo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/320f8bfe-5e6e-4309-8a21-623f89546efa/69307098490.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33963dca-5616-4304-bd54-8867a763bbad/images_of_organization_charts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/241f9a6d-7e0a-4e92-a856-d727c55255b6/zugapatawil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c212e165-1d1b-4f7e-a344-fdf56594d7e9/denon_avr_1612_remote_control.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ab51ddb-9fe8-4af4-aea9-7bf3c4d63a67/nevibeda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c961eaa-4144-416f-b576-a2605cbca38f/is_nikon_d40_still_a_good_camera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b08b35b2-f202-4e5e-8267-740dbde9e039/lopif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a77868dc-20c4-4a47-99dc-69ce9cdd5920/96521311741.pdfIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10238 6440 bytes
SHA-256: 629123bfde0685c5f69bbdd27ec008bde0224d5c30af1dabb990f6ee33ea778e
font_01_sfnt_off0001122c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122C 5504 bytes
SHA-256: 78fda562b03a383d48d4537e06144ac42427796d3b8a070283bac0b8a8f7915e
font_02_sfnt_off000124ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FF 11396 bytes
SHA-256: 3cb5f11aaeae1d8c31c76d5aa5f2aac9c9433934c59d3e05cac760f8ede6bcff
font_03_sfnt_off00014c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C53 16144 bytes
SHA-256: 18f56b7fae04e07bc119a468ad323bdda099da77b0772854d1c47cc1f39b9f3b

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