Malicious PDF — malware analysis report

Static analysis result for SHA-256 97d859098701a13f…

MALICIOUS

PDF

39.9 KB Created: 2020-10-10 19:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6f0cf77fea1d0a7f78a6245f1d28e155 SHA-1: fc96fe5badc1483ade09fdbd369f8c5523832e0d SHA-256: 97d859098701a13f1a5935e8da8a79b49638ca31026d2faa4d04d66584e42676
184 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and flagged as part of a link farm. One critical heuristic indicates a direct link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/pify?keyword=microeconomics+final+exam+multiple+choice In PDF document text
    • https://site-1036659.mozfiles.com/files/1036659/nefun.pdfIn PDF document text
    • https://site-1036939.mozfiles.com/files/1036939/mifazufenezolizoladez.pdfIn PDF document text
    • https://site-1042504.mozfiles.com/files/1042504/gisavozag.pdfIn PDF document text
    • https://site-1036680.mozfiles.com/files/1036680/vifiginajewoxowezekubelul.pdfIn PDF document text
    • http://fudema.greenergreensdelivery.com/uploads/1/3/1/6/131606469/354677.pdfIn PDF document text
    • http://files.sharonbohjanen.com/uploads/1/3/0/7/130739755/sapefifuluzotok.pdfIn PDF document text
    • http://files.msgrp.us/uploads/1/3/2/8/132814166/xabuzalewurowukusade.pdfIn PDF document text
    • http://files.sixeightapparel.com/uploads/1/3/0/7/130775180/408283cbc8872.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/a4de3f44-637d-4625-b748-0a272ba51e86/74495015589.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4332da41-6a91-4145-baa3-dd15c50304af/56394954848.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69b98e54-08f2-4e0b-8860-094f70c53653/15867055936.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24f7d08d-7e9e-444a-9854-d00abaa515c6/gexunerigobomoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85dde52b-06aa-4a4d-8b01-312d96c16047/86832532746.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65b888bc-91b9-4ac3-a35d-83b17df01337/10396808510.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3186b4b8-8bcd-40ac-b4f5-ad5e6d8cc9b5/70166532947.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4d90cbd-a339-428c-b254-195a8e1f6118/72658175200.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_off00005de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DE8 5328 bytes
SHA-256: 8403f18a9db5e3f6fcd7ec6378df93b991796ac43fc6a94b2359bd9dc6d85b11
font_01_sfnt_off00006fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FDE 10060 bytes
SHA-256: a2416c1b7bd7602562b807e4c8deb7eeb0265a78ba4b26c986e208d999c1b2e0

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