Malicious PDF — malware analysis report

Static analysis result for SHA-256 41dccc1b08d103f1…

MALICIOUS

PDF

73.8 KB Created: 2021-03-10 20:24:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b1a8e112199e73648d18f7b1aef9806c SHA-1: 4d2739be2ea05374d5a2471c62609c176344efda SHA-256: 41dccc1b08d103f191da23bcc671e3efdbc4741a4c0a952b037a8d95c1e1df79
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO abuse. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the presence of embedded URLs and the nature of the link farm suggest it could be used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/award?keyword=vector+quantity+pdf PDF link annotation
    • http://kyponnik.online/scratch_programming_games25zhs.pdfIn PDF document text
    • http://italywow.pro/worksheet_on_abstract_and_concrete_nounsc3ty9.pdfIn PDF document text
    • http://dominis.xyz/miwexalsyosa.pdfIn PDF document text
    • http://playmarket-online.com/best_online_and_offline_music_playerq9dj2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_7d80ffd063c34639bef3091a20c64a7f.pdf?index=trueIn PDF document text
    • https://200ee3fc-349d-4871-b5c3-2c1c69b60476.filesusr.com/ugd/7b00a0_65cb2b592e1349d58bdaa33b314ca741.pdf?index=trueIn PDF document text
    • https://8ecf7690-1f99-4e28-a4b6-3228ba9731d7.filesusr.com/ugd/63d3ad_55dfb1484c664003952e277cbc768fe1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0087c9b6-ba9e-40d3-8595-35839b0aa50e/11893297228.pdfIn PDF document text
    • https://e1bd05e7-a2ed-43df-b5fc-9bc8ee0b1a84.filesusr.com/ugd/08acf3_80e3d1d2c5824fed912a36fdf30fed5c.pdf?index=trueIn PDF document text
    • https://d52369c8-37f2-40d9-9d5f-d682b3b4a2e4.filesusr.com/ugd/6d5a7b_465f7ed5e89c4a66add07771bb4725d4.pdf?index=trueIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_9c6e6d3c7233425faa0c8ebfe99b0018.pdf?index=trueIn PDF document text
    • https://19a39513-20cc-49d1-a75c-e30ce0314142.filesusr.com/ugd/f99735_e2a4d85117e945cc824224204026e024.pdf?index=trueIn PDF document text
    • https://d525ee04-2a40-494f-8ba9-fee52f7b18ee.filesusr.com/ugd/8b8e24_cc0cca24ebed4a55948053e4e54112ef.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/19e38ef6-7dc1-4e00-9c69-117643897be0/20509513491.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8552b52c-2903-47c1-a401-b3623bde8e70/hamilton_beach_18_qt_roaster_oven_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25a299a2-933e-49d5-8c27-c4b5cad62504/ingenuity_portable_swing_-_cozy_kingdom_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e6c5c85-c1b3-43e6-a2c7-53c80034c655/roland_spd_11_pad_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdf9ae09-3ea5-4498-8bbe-e17fb1d42f69/how_to_use_garmin_gps_78s.pdfIn PDF document text
    • https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_e74b7b60a39d493ca003d84b6cb95dce.pdf?index=trueIn PDF document text
    • https://6f81cef9-66a2-447d-9e1d-4c0427ef15c5.filesusr.com/ugd/4d935e_862c3949b1c748d0becf7c6ed651ad5e.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_off0000e5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C6 5132 bytes
SHA-256: 36bd2c4dcab58ace0bee071262ad8d2effb2a67a4843f4e8d98707822ce6f16b
font_01_sfnt_off0000f75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75F 10124 bytes
SHA-256: 90cb08eaa1c50bcc9f826cd3d10dd261ef8b3eac255893f1924992e0993fc9d4