Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b6427c5abbb383f…

MALICIOUS

PDF

72.9 KB Created: 2021-06-06 05:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d6310ce2d394fde06c2f9bc7f534d8aa SHA-1: 719b0696cd47d493d99ef51c271645c516eb4211 SHA-256: 6b6427c5abbb383f2e588244f243f43127314a664ef8764dba518d5723185e37
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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://garglob.ru/pbw?utm_term=printable+vinyl+sheets+for+laser+printer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412573/normal_601a05b16c9e7.pdfIn PDF document text
    • https://pugojowu.weebly.com/uploads/1/3/4/3/134334477/sigavivoxefuvo-kaxuzimi.pdfIn PDF document text
    • https://babilazumi.weebly.com/uploads/1/3/4/6/134666759/e3f6cec16cadcd.pdfIn PDF document text
    • https://wixuzezokanozav.weebly.com/uploads/1/3/4/6/134663812/tapex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381082/normal_5ff66baaa6119.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403120/normal_606cdfe7e7e66.pdfIn PDF document text
    • https://sagunuriwofe.weebly.com/uploads/1/3/4/6/134602517/2f1d3f39410956.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459774/normal_601e102f6983c.pdfIn PDF document text
    • https://rudozusaviso.weebly.com/uploads/1/3/4/0/134041113/46682844948d.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/e70c3c1f-425d-46b4-ad5c-e3c8e4dd65f3/lenomumagokekumokivog.pdfIn PDF document text
    • http://xoxafepapesu.pbworks.com/f/screen_recorder_with_facecam_and_audio_video_editor_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7962e27a-bfcf-4be6-b636-0f474277c1b3/what_is_the_statute_of_limitations_for_theft_in_illinois.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d0a9767-f935-43de-be6f-30e5f8bc72a1/fubofosozujiso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d57cc5ca-e4a7-41be-9ec0-ead43f7da85b/husqvarna_455_rancher_repair_manual.pdfIn PDF document text
    • http://zufumegi.pbworks.com/w/file/fetch/144422358/jufojekibitox.pdfIn PDF document text
    • http://wejojixi.pbworks.com/f/explain_how_to_solve_a_system_of_equations_using_the_substitution_method.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da009226-3656-48a2-b8ba-8213ffdaf1a4/fractions_practice_puzzles_answer_key.pdfIn PDF document text
    • http://vakerul.pbworks.com/w/file/fetch/144504141/66226749324.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c439932b-53fa-4ad1-96a0-941683648fd9/what_is_vacation_mode_on_whirlpool_refrigerator.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/f/is_code_for_bulk_density_of_aggregate.pdfIn PDF document text
    • http://jajafad.pbworks.com/f/99574349334.pdfIn PDF document text
    • http://gajufabeke.pbworks.com/w/file/fetch/144423063/how_much_do_designers_charge_for_a_logo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a092462-a402-41fb-bac9-ef143ac58bea/stick_rpg_2_evil_walkthrough.pdfIn PDF document text
    • http://memofemovo.pbworks.com/f/pipe_fitter_guide.pdfIn PDF document text
    • http://felinemumivu.pbworks.com/f/cdg_karaoke_player_download.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18E 5292 bytes
SHA-256: 8609e8b7b18f04ffbd2d01ffdc7af676fdc171e54bbd30c5d364a62d66c7078e
font_01_sfnt_off0000f38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38E 10016 bytes
SHA-256: 6b6e6561b2312f999ad4fa160b575856c8eef0097cce3d3dc79c8d33c8883b90