Malicious PDF — malware analysis report

Static analysis result for SHA-256 23e3300b6f10864d…

MALICIOUS

PDF

118.0 KB Created: 2021-06-02 13:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2a49daebaaae6097510c221b5c71f62 SHA-1: cc5c3c5781135700018ac0ff8fa1abcd8548c8f8 SHA-256: 23e3300b6f10864df111e0fd54e5c2a985737477222e809b8923b6e2b5a0d807
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 are SEO-optimized and point to other PDF documents, suggesting a link farm or SEO poisoning attempt. One of the primary URLs, https://crewmak.ru/pbw?utm_term=engineering+economics+6th+edition+fraser+pdf, is suspicious and likely leads to a malicious payload or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crewmak.ru/pbw?utm_term=engineering+economics+6th+edition+fraser+pdf
    • https://bolafuba.weebly.com/uploads/1/3/4/6/134668532/b6fa77171705b.pdf
    • https://losujawidejope.weebly.com/uploads/1/3/4/3/134310111/e986e2f07695c.pdf
    • https://fofijibub.weebly.com/uploads/1/3/3/9/133999799/5919253.pdf
    • https://titobabedax.weebly.com/uploads/1/3/4/3/134317276/kekob.pdf
    • https://tozubovudifudi.weebly.com/uploads/1/3/5/9/135973827/f2a20.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4702b5db-b4d8-4495-9be5-0baa8577fbe4/brother_hl_22400_driver_windows_7.pdf
    • https://uploads.strikinglycdn.com/files/ae66f6f3-c042-4b1d-84e2-aa685a12ab5f/58093242473.pdf
    • https://uploads.strikinglycdn.com/files/8b77572d-5035-403d-909d-ce6718d39568/foboramopanisi.pdf
    • https://uploads.strikinglycdn.com/files/13b364ef-08a8-4a53-8856-95ad93a37cf0/redemejamisulafevolud.pdf
    • http://sajateves.pbworks.com/f/73041795366.pdf
    • https://uploads.strikinglycdn.com/files/f672efdb-c5b3-45d6-ad4e-08ef63c1211f/benajegojudimuvevejidezim.pdf
    • https://uploads.strikinglycdn.com/files/ec7bb867-9b1e-453b-949d-19ce871eb7ba/what_is_the_most_popular_menu_item_at_taco_bell.pdf
    • https://uploads.strikinglycdn.com/files/260cfb78-54dc-4638-9c6b-7db2f10499c1/xufefowomalatevu.pdf
    • http://kufogokoges.pbworks.com/f/12089421953.pdf
    • http://junerew.pbworks.com/w/file/fetch/144501963/what_are_the_phases_of_instruction_cycle.pdf
    • https://uploads.strikinglycdn.com/files/050dae19-3934-4f7d-bb54-70908491df4f/birds_and_the_bees_story_online.pdf
    • https://uploads.strikinglycdn.com/files/2286da0e-58cd-4f2b-81d7-18b2ff162f38/61473901403.pdf
    • https://uploads.strikinglycdn.com/files/60221eed-8042-4781-a1e9-176cafeed9e1/17192880535.pdf
    • https://uploads.strikinglycdn.com/files/27292f62-ccbe-4eb5-9213-45eb0c28931a/andreuccio_da_perugia_atlas.pdf
    • http://vananizi.pbworks.com/w/file/fetch/144503394/homophones_and_homographs_worksheets_grade_4.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_off00018f49.bin
643334e4b6e8222dec033bc51e330f3503a2fc12b497ec95e3abbd6b12af60bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18F49 5648 bytes
font_01_sfnt_off0001a261.bin
3b68455a702ca5304bad7092818f10bfdf2b6489388e23886014c3d3abe07291		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A261 11764 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.