Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a9ff5929282139…

MALICIOUS

PDF

86.1 KB Created: 2021-05-18 11:30:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7c887b54dba4c19dff8dcd7692990139 SHA-1: 691a9250b5cf3e169a06c2226e6d11fc410339f5 SHA-256: c8a9ff59292821397db01d9841c684611b46f22feeb7d4664c1d72e600652b67
186 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, designed to mimic search results for popular content like movie downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of multiple external URIs and a link farm heuristic points towards a malicious document designed for user redirection.

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://vilenefex.ru/strik?utm_term=jack+the+giant+slayer+hindi+movie+download+mkv PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405202/normal_605b9eeee1888.pdfIn PDF document text
    • https://nalodewemutut.weebly.com/uploads/1/3/1/1/131164475/buxogukarera.pdfIn PDF document text
    • http://menetufebev.22web.org/revista_casa_viva_gratis.pdfIn PDF document text
    • https://gixapogaruxa.weebly.com/uploads/1/3/4/3/134331356/5014431.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368768/normal_5ff7649f8674f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463006/normal_600bf3dbb9bbe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nupabumafe.epizy.com/fundamentals_of_quantum_chemistry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1188ea0b-f44a-47c0-bbf7-2df5ca6e9f02/q_significa_pedagogico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbcdc87e-f356-4774-96fa-14b3d7637a44/xipaxipamomozevaguxow.pdfIn PDF document text
    • http://tulutubuvidimo.epizy.com/can_i_download_apps_on_my_panasonic_smart_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82cb7b90-4315-4430-82a8-b4b3409fa5bb/kunojebagenaziguketanipo.pdfIn PDF document text
    • http://dopozidimosopa.rf.gd/walt_disney_biography_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86ede0c1-d8ce-4932-91bb-84e73ea3bd76/how_to_connect_skullcandy_earbuds_indy.pdfIn PDF document text
    • http://lirifamagugo.rf.gd/levapejujizokomomazivul.pdfIn PDF document text
    • http://jipumenovimol.rf.gd/savelimusuwedu.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000120b5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x120B5 24160 bytes
SHA-256: 80831e88c75f832c61634d3ca9e133b17b24a1250753d0506511c272691d4717
font_00_sfnt_off0000e671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE671 5660 bytes
SHA-256: 7e54d9e05e63b6f52360c1f97536f93d8a4f81cbfde89213ab88bed59555c47d
font_01_sfnt_off0000f9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A0 11816 bytes
SHA-256: 8dee69c81667c2b918af9fd34a7d7bc4f29ba015e0a5e150ba386a5999377a3c

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