Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0a8ca2d1615457e…

MALICIOUS

PDF

71.8 KB Created: 2021-04-14 17:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a5291212b7af56a851037ef6e9cd0f41 SHA-1: e97844883d62f75aa61ac6e1700f16db4bc4ce53 SHA-256: f0a8ca2d1615457e2e0a327c3bbc116ad978b786ef0151f7befd6807053423d4
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 0.9998

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://dugedepap.ru/strik?utm_term=2005+honda+odyssey+sliding+door+won%2527t+work PDF link annotation
    • http://instasale.company/fa_date_sheet_2019_balochistan_boardmks1k.pdfIn PDF document text
    • http://kutebirodomo.22web.org/xamisazudikapufobul.pdfIn PDF document text
    • http://idealica-italiaoficial.site/sugar_changed_the_world_prologueqfwrz.pdfIn PDF document text
    • http://theplafond.xyz/pro_engine_blueprintingqis55.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/f89922bc-8514-416d-b5aa-bf1412ef4fc9/66185662967.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b73454bd-0528-48e3-9d3c-324fc968408d/toyota_corolla_2016_battery_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0e58884-879c-447f-b9ae-2d100eea533e/63162975647.pdfIn PDF document text
    • http://kevawiposiwa.rf.gd/avery_weigh-tronix_model_640_manual.pdfIn PDF document text
    • https://f538c46d-6aff-4997-95da-320e40b30403.filesusr.com/ugd/262ba4_815adba1b3bc4ad5a0c889cb4fef6b98.pdf?index=trueIn PDF document text
    • https://2c549fd3-bbcc-4e43-aea5-84609313cfd4.filesusr.com/ugd/c162b3_39e1d59c29dc4d3c903d3e73abf82f85.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1d646a6-9cfb-455e-b58c-41a7937592b8/tikunevinepaxunotix.pdfIn PDF document text
    • https://6c8ebe11-725c-420b-823a-68bc39d02ad2.filesusr.com/ugd/3e87bf_3ebe90b7631d49909c205787f8954a2c.pdf?index=trueIn PDF document text
    • https://e301b21f-f707-426c-a094-6199d4b1a2d6.filesusr.com/ugd/f65518_b35465a9b7ce4db09b0589d16b0dacb5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/831e2bf9-1ee0-4bec-91db-874130edb532/89107809067.pdfIn PDF document text
    • https://dba0ca6b-c979-46b3-87c9-041648dee063.filesusr.com/ugd/6f58fb_67424bedb6274612836fcad4525179f6.pdf?index=trueIn PDF document text
    • http://kedipakusox.epizy.com/wufujejonemadexubofu.pdfIn PDF document text
    • https://528a8416-53f4-4693-bcf0-540471887af1.filesusr.com/ugd/c3aa89_5424317d5bcb4b5aa2d61386a9376606.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/63c598d5-c359-4e92-b7ca-7bedd4db6cc7/the_gospel_of_wealth_promotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/750d8d99-02f2-4b58-8cf8-d50e6ece1423/html_and_css_design_and_build_websites_amazon.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_off0000d9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A3 5680 bytes
SHA-256: 290498be852ab884fc6953ef6a74fb62b8a963938e473e9c270533c851c1de90
font_01_sfnt_off0000ed15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED15 10744 bytes
SHA-256: 73f54438533bba6c16050320a7f881f7f41d471cd6c4e3fedaac4d0ed6da999d