Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccb6ca465c70966c…

MALICIOUS

PDF

80.4 KB Created: 2021-05-02 11:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07dff1837d58477ac5cbb36624c9d479 SHA-1: fda5259d1da48fc29d14f5ea419922f15067ecb8 SHA-256: ccb6ca465c70966ca83b592418475a3b077cb63d325d6233c1ef5ba8cf665d9d
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. One of the primary URLs, https://nipisod.ru/strik, is likely a gateway to malicious content. The ML classifier strongly flagged this PDF as malicious, and the heuristic PDF_SEO_LINK_FARM indicates a mass of external links, suggesting a malicious intent to redirect users to potentially harmful sites.

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.
  • 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://nipisod.ru/strik?utm_term=what+is+the+biblical+definition+of+evangelism
    • https://bogezemobazuv.weebly.com/uploads/1/3/1/8/131856224/lisakinotir-kufosipuvilo-zoxenetev.pdf
    • https://cdn-cms.f-static.net/uploads/4374521/normal_6011004b83f54.pdf
    • https://cdn.sqhk.co/jesupesiparu/s1jinhf/91599787957.pdf
    • https://cdn-cms.f-static.net/uploads/4477156/normal_60378dc542b40.pdf
    • https://kixifosesezor.weebly.com/uploads/1/3/3/9/133998007/4903441.pdf
    • https://cdn-cms.f-static.net/uploads/4445570/normal_6065e0d7cb79f.pdf
    • https://cdn.sqhk.co/sezabaxo/hcihyeN/saberforge_lightsaber_colors.pdf
    • http://bokazisenu.22web.org/57135069451.pdf
    • https://dopotalufiru.weebly.com/uploads/1/3/4/6/134601398/52fed89491a7ea.pdf
    • https://cdn.sqhk.co/zogameva/cOE0djg/88609427109.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wozunajovufati.rf.gd/mivibipolor.pdf
    • https://uploads.strikinglycdn.com/files/7d2024ef-8ce4-4204-bb86-8015b3b6fcbb/mastery_robert_greene_audiobook_youtube.pdf
    • http://dujojovixotik.epizy.com/wallpaper_ansatsu_kyoushitsu_hd.pdf
    • https://7737876a-f762-42ef-af6f-18b78abacabf.filesusr.com/ugd/9066bd_c902821bd71041e9a7948800e7f9d172.pdf?index=true
    • https://f3874c2d-c116-49c2-b7b6-9300dc8fc43e.filesusr.com/ugd/b11f6d_18b94f5b20594735975ea79c7a3e1d44.pdf?index=true
    • https://uploads.strikinglycdn.com/files/089e8ca3-dc22-4c8d-ae7d-3d9a6ff4bb12/do_seasons_need_to_be_capitalised.pdf
    • https://uploads.strikinglycdn.com/files/ccaa3feb-062d-480c-96aa-5f6a9ce483ea/20464604312.pdf
    • http://xakitidopapav.epizy.com/14625132055.pdf
    • https://5405d108-7f1e-482b-a10c-e06f62b7505d.filesusr.com/ugd/d941b1_7cb5832e04604523b608268914ef6b9f.pdf?index=true
    • 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_off0000fc74.bin
b9d8412d927f197eb16d9187403636581526f3799eed5a6d9c12c24474ade02c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC74 5552 bytes
font_01_sfnt_off00010f4a.bin
23a516c57b15a9fa2b803379c9ebed145a337e6693ee0b5571e71291b1484335		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4A 10880 bytes

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