Malicious PDF — malware analysis report

Static analysis result for SHA-256 234d6775ce0cb24c…

MALICIOUS

PDF

80.2 KB Created: 2021-03-31 08:23:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 619f2a1461fb45e0fadd11c6d2f0fd3f SHA-1: 1b21af125264dcb004c9f87a95867b6e54b25233 SHA-256: 234d6775ce0cb24ccf53d4d6a828b3b5db52ebb1f5f262aac6c5c0ca016f7511
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable domains and Weebly-hosted PDFs, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the link farm heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/123?utm_term=autogyro+calidus+performance PDF link annotation
    • https://bawekiseboluxis.weebly.com/uploads/1/3/5/3/135327810/8094845.pdfIn PDF document text
    • http://xovijezup.mywebcommunity.org/free_printable_board_game_templates.pdfIn PDF document text
    • https://pelimabogex.weebly.com/uploads/1/3/4/6/134685965/c56f5571e2436.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • https://xapeposatu.weebly.com/uploads/1/3/1/4/131437079/tawalutusizuw.pdfIn PDF document text
    • http://betmoy54.com/pioneer_deh-x6500bt_pairing_full4cz29.pdfIn PDF document text
    • https://datotizit.weebly.com/uploads/1/3/4/6/134696706/6588953.pdfIn PDF document text
    • https://pufoxedoj.weebly.com/uploads/1/3/4/4/134438994/toweje.pdfIn PDF document text
    • http://lnstagram-helps-contact.com/ethnography_research_designz37bn.pdfIn PDF document text
    • https://sojekaga.weebly.com/uploads/1/3/1/0/131070529/47cc89ee.pdfIn PDF document text
    • http://cadenalia.com/application_video_browserkjfcu.pdfIn PDF document text
    • http://ruguwafe.scienceontheweb.net/12202481077.pdfIn PDF document text
    • http://regsenatvumen.website/vista_valley_tC3BCrkC3A7e5jgv5.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/94e1e2b8-d62c-4a90-992e-966006b105da/should_i_take_sociology_in_high_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ef1c6f7-fcc0-4b13-bc59-8c2dfe60de8e/6139458720.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c94c4920-e81d-4cba-996e-db6ee9ba35d7/77345010121.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/884b8d4a-f136-47f1-817a-4c532c254c14/playboy_magazine_cover_template_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef64b127-d138-42fb-9d5d-a0f344b2a6dc/power_pressure_cooker_xl_vs_instant_pot_cooking_times.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4a86b28-95db-467a-b324-239db40f8296/kovoxuvifoniwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51957ecd-3528-4733-8332-560631238f4e/fixisomexewiwasejosu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ad6ae74-cbd0-4eb7-bae4-87b4f7764de0/fudepotegiketikipeluvoduk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f88590df-0187-40ce-8e01-78b9043ce16a/tubolebirime.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_off0000f38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38B 5564 bytes
SHA-256: e2c6a6fb5045281d6829fb5183660a277e670da58902377c59a1a2140b3e8a76
font_01_sfnt_off00010678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10678 14004 bytes
SHA-256: 5d40f1eab983f67a91281448dd2a10b90c9ac198582c4ebd0bc6bbbe57800e45