Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3831e9bea2bf28d…

MALICIOUS

PDF

88.7 KB Created: 2021-03-22 09:05:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3a019c4a3596ba5c43bb3b671a7a426 SHA-1: 4f6026ebf6626034659834d82bf8321965c5e3a0 SHA-256: c3831e9bea2bf28d44aa07ca699a4632f6a21302e99dcd47e71b65d88c2a4e1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which are generated and appear to be part of a link farm. The primary URL, jumiwimov.ru, is presented in the context of a Garmin tutorial search, suggesting a phishing or scam attempt to drive traffic to malicious sites. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/strik?utm_term=garmin+gtn+650+tutorial
    • https://cdn.sqhk.co/weteroliwo/gjjbUwR/87098205005.pdf
    • https://bidekefit.weebly.com/uploads/1/3/1/6/131606331/715d30.pdf
    • https://cdn.sqhk.co/tosobulig/hdiAijd/mini_elm327_obd2_ii_bluetooth_review.pdf
    • https://cdn.sqhk.co/wirubetena/iilW3gg/pac-_man_and_the_ghostly_adventures_2_ps4.pdf
    • https://cdn.sqhk.co/jevikepuja/vKji7hj/smart_update_manager_8._3_7_download.pdf
    • https://wivixape.weebly.com/uploads/1/3/4/8/134897282/tekuvagivasufof.pdf
    • https://cdn.sqhk.co/nuzitomizaj/hf6jfrW/england_v_wales_rugby_world_cup_2015_highlights.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/8ad4b135-d606-4d3d-a85f-6f6bfd48875b/how_much_money_does_an_er_doctor_make_per_hour.pdf
    • https://uploads.strikinglycdn.com/files/9cfc175d-953c-41bd-9a1d-a0ceebe5fc55/how_do_you_thank_customers_for_positive_feedback.pdf
    • https://uploads.strikinglycdn.com/files/eb1d2d1d-998a-42a7-865d-b7be234a6c56/how_much_do_lessons_cost_at_school_of_rock.pdf
    • https://uploads.strikinglycdn.com/files/5f234045-15a0-4514-bd3d-73c6a703be1c/hoy_seor_te_damos_gracias_por_la_vida_la_tierra_y_el_sol.pdf
    • https://uploads.strikinglycdn.com/files/20831ab4-19c4-4aff-85da-f0df0ce7c21a/why_is_it_called_a_dance_with_dragons.pdf
    • https://uploads.strikinglycdn.com/files/888b092a-9a1a-4dcf-b1ba-cebc34e5422b/5018545005.pdf
    • https://s3.amazonaws.com/tiduro/what_shotguns_have_slam_fire.pdf
    • https://s3.amazonaws.com/nawosineromigi/bitbucket_zip_repository.pdf
    • https://s3.amazonaws.com/lixasifasi/synthesis_of_trans-_p-_anisalacetophenone_lab_report.pdf
    • https://uploads.strikinglycdn.com/files/a0bf111b-15da-4764-a056-b5221bf2ebf1/47626408578.pdf
    • https://uploads.strikinglycdn.com/files/0a4fa40c-c31e-40c3-b8ed-49b448ab3f76/95405997223.pdf
    • https://s3.amazonaws.com/sulasatevirexo/spotify_desktop_mac.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee46.bin
9fba9b0d9e2cc48f58c52755440c9a9bb3bd4c5dbe3d8c853d7e81cca7fbdf20		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE46 1872 bytes
font_01_sfnt_off0000f73b.bin
afd02c770009e873a576a70beef7975294cbdbe47380c34a84134292ea1623d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF73B 5044 bytes
font_02_sfnt_off00010843.bin
b272cf298e40bfc043ccad8bde0fe976b7676ea059aff342e1d7ae80dd9aa4af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10843 11740 bytes
font_03_sfnt_off00013022.bin
ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13022 16092 bytes
font_04_sfnt_off000144ea.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x144EA 4324 bytes

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