Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c8dba3e16307b94…

MALICIOUS

PDF

74.9 KB Created: 2021-04-17 03:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 68a1939a27b90bb6bdf971660c26bb7d SHA-1: 542e33f7594d09e65197b2c32e770d46bee30a32 SHA-256: 7c8dba3e16307b94f3929cabd26475578c2f399a3f139631c16933218cf935b5
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 0.9997

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://seumenha.ru/strik?utm_term=air+force+one+shadow+pastel PDF link annotation
    • https://cdn.sqhk.co/figotabam/CpMjMid/topamakerukunibovidevezi.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/eyciiCs/40935038267.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411932/normal_606ba61f222d3.pdfIn PDF document text
    • https://vogaxuruxav.weebly.com/uploads/1/3/4/3/134352923/kobedepewese.pdfIn PDF document text
    • https://bimevaxufozuz.weebly.com/uploads/1/3/2/6/132683359/5947996.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453103/normal_60530fffaf16c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486751/normal_6026f7d937356.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473938/normal_5fc98d427cb62.pdfIn PDF document text
    • https://makumanufomogo.weebly.com/uploads/1/3/0/8/130874647/0587d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501042/normal_603bffb2dd8bf.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/af8da6af-fa04-4697-b383-45c7361b7060/21924915616.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/kelvinator_ac_remote_manual.pdfIn PDF document text
    • https://4461694d-a6f7-4a69-895a-ff5ddeb3c622.filesusr.com/ugd/f504fb_c6f435553de1463eab8246899e93373a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec183fda-3a0c-4e21-b326-bd3940249f76/32114183162.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/341d036b-cfe1-4881-b1e3-5209b7fe3048/gavufidixenukowejikarut.pdfIn PDF document text
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_95a417bdb5c94cab9e6352e625250ae8.pdf?index=trueIn PDF document text
    • https://fab88ded-2f12-46c9-b6ec-f290036286cc.filesusr.com/ugd/cce69c_c308c1306ed747708ebd93097fa6736d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b811945-e2f3-46f0-bc89-a08779f123b0/71820707035.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/the_atheist_s_mass_balzac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b7b8f38-abf6-4f4d-a85b-77632be77a00/vimusemate.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_off0000e94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94B 5324 bytes
SHA-256: 8dd32b5e4ea2286c0ea18e39d1ce0fc48e75a81f858e37a000fa177939139f24
font_01_sfnt_off0000fb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7C 10340 bytes
SHA-256: d2efd67ae8b6f2b6afddc086fda4cc62ce34ff273cc259324f91b609ca0fd269