Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c85d6f8ff4c245a…

MALICIOUS

PDF

74.7 KB Created: 2021-03-30 15:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 13ea1bccd57152e39c15ed5a9fb79314 SHA-1: 3e90cdefe82a17a7ac1e2d1de363bd30004b3c8f SHA-256: 7c85d6f8ff4c245abb3aa9eb6e213e8e91677578683843cecb9ad360855a61ea
186 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's part of a link farm. The document body, though heavily obfuscated, contains references to 'asphalt plant operation pdf' and 'wkhtmltopdf', suggesting a lure to disguise the malicious intent. The presence of numerous external URLs, many hosted on disposable domains, points towards a campaign designed to drive traffic to potentially malicious or SEO-manipulated content.

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://leonvi.ru/award?keyword=asphalt+plant+operation+pdf PDF link annotation
    • https://falitevegenos.weebly.com/uploads/1/3/4/3/134321562/suvimefod_dewax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453890/normal_605f543f7c8f6.pdfIn PDF document text
    • https://dajidavibaral.weebly.com/uploads/1/3/4/6/134606929/d78c6dfbda024f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480585/normal_6009ae3b31f4a.pdfIn PDF document text
    • https://xuvupidorok.weebly.com/uploads/1/3/1/4/131407629/tosifidotadojiruf.pdfIn PDF document text
    • http://goodshopsales.xyz/cell_phone_screen_capture_androidp7nge.pdfIn PDF document text
    • http://hookup157.online/vimaruxumolokisosuref94sc8.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/f92af214-90f5-40cf-a18e-00d7fe143827/dodamupubosojafowinometov.pdfIn PDF document text
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_ebf65731fc5f4a759012f86f5ca883fa.pdf?index=trueIn PDF document text
    • http://xifawuzegeliwag.rf.gd/58139996779.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d121c1d-c832-4b4e-9a43-40ddf9f553da/does_raphtalia_die_in_the_manga.pdfIn PDF document text
    • https://37523d11-79cf-4eb3-ada4-f05de57c71ee.filesusr.com/ugd/275374_fad8666b026249e29c6d569198e93979.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7008d544-e6fa-4905-8ca4-64e2e1633816/78700338074.pdfIn PDF document text
    • https://b7953657-6b45-4ea9-9d9d-f701e3f26526.filesusr.com/ugd/45996c_1428838152aa49e4bbafcd18e42986b4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c85da986-0572-416d-a4fc-0c5bdffce902/club_car_repair_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11e7a011-e6a3-4509-aae3-347eca98f5ba/vopiwo.pdfIn PDF document text
    • http://mudepenota.epizy.com/81196508583.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_off0000e8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EB 5120 bytes
SHA-256: 412b293a08592c252aaf9ffbea135affaab756c5cf42747855f0039423b6f36a
font_01_sfnt_off0000fa4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4A 10380 bytes
SHA-256: dbb34f67c7a3750de2d68132c0f794feb456ec6a89efdf93201e2e2de4acedbe

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