Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ff3d14733d3f73…

MALICIOUS

PDF

77.2 KB Created: 2021-03-31 02:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: aaf884de9588ce21acf9b95c7884fc0f SHA-1: 126352ed70dc3dba4b4bfbd0e56750d3094f8219 SHA-256: 91ff3d14733d3f7376822bcf10046848708ce0db41c75443b373ad71ad3a12ab
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-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://pelibifir.ru/strik?utm_term=1998+chevy+blazer+stereo+wiring+diagram PDF link annotation
    • http://comforfemj.fun/spotify_target_audiencei3mgb.pdfIn PDF document text
    • http://koreanluxe.com/how_to_replace_the_belt_on_a_hoover_dual_power_maxwltrh.pdfIn PDF document text
    • http://lordtrans.ru/the_ministers_black_veil_analysis4l3hg.pdfIn PDF document text
    • http://ompala.store/424253166266we40.pdfIn PDF document text
    • http://tameeniraq.com/51514176432wfj4.pdfIn PDF document text
    • http://italiabeach.space/run_ball_gamei0464.pdfIn PDF document text
    • http://graatorama.fun/facebook_audience_network_ios_sdko1323.pdfIn PDF document text
    • https://nanawoxemataxu.weebly.com/uploads/1/3/5/3/135332584/1018834.pdfIn PDF document text
    • https://vipopatovosidop.weebly.com/uploads/1/3/0/7/130775456/6855855.pdfIn PDF document text
    • https://rofaxebawo.weebly.com/uploads/1/3/4/7/134750080/revujunukine.pdfIn PDF document text
    • http://musofiron.ru/wivolezojuwi9ci35.pdfIn PDF document text
    • http://particuliers-societegenerale.xyz/vuwudonupisidokjeyva.pdfIn PDF document text
    • https://vigajinid.weebly.com/uploads/1/3/4/8/134889024/7851927.pdfIn PDF document text
    • http://lnstagramcopyrightservices.org/regikevoper8km9.pdfIn PDF document text
    • http://kovezemunoropu.iblogger.org/75197949050.pdfIn PDF document text
    • https://vimikova.weebly.com/uploads/1/3/1/4/131437612/1e551.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_ce77d499543842d4aaba857b1f7e7626.pdf?index=trueIn PDF document text
    • http://fejusudoboriduf.rf.gd/firefly_phone_2018.pdfIn PDF document text
    • http://zetipetarot.rf.gd/88899572579.pdfIn PDF document text
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_6dbdd1cc0c6a43efbdd75f0b895dc679.pdf?index=trueIn PDF document text
    • http://logilifi.epizy.com/reporting_and_analytics_manager_resume.pdfIn PDF document text
    • http://fobegakolu.epizy.com/abdominal_hysterectomy_steps.pdfIn PDF document text
    • https://89e1056b-8c01-44a4-bea5-a80a497d444f.filesusr.com/ugd/6db6f7_482935184e074d888f2baf35291141e8.pdf?index=trueIn PDF document text
    • https://21319658-e817-4d6a-846f-872ccfe0f0c2.filesusr.com/ugd/982af2_dfa7a3e211414a6e901919f8838e8b02.pdf?index=trueIn 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_off0000edd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD6 6104 bytes
SHA-256: c683c40cc751523830bde98a016551a2ab6e403e2dad7163554796aedd7ecfa8
font_01_sfnt_off00010290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10290 10544 bytes
SHA-256: 0a60a4dee72ada43b6fd23bb06bfa47ba37129324be7ee7fd5aed438a3d43020

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