Malicious PDF — malware analysis report

Static analysis result for SHA-256 07db0bbf4fe3a459…

MALICIOUS

PDF

81.4 KB Created: 2021-03-27 17:54:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d9064d6f5c84bea79b22125c6e07df5e SHA-1: 56c08ab11c1bf5659ecce81990d86ca576970b79 SHA-256: 07db0bbf4fe3a459c8c8499c113c63f43b2eb5ba5418dbcf739891d5a538939b
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with the primary URL being 'https://jacksth.ru/award?keyword=angulos+complementarios+y+suplementarios+1+eso+pdf'. This suggests a phishing or malware distribution attempt, leveraging SEO-like keywords to attract victims. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://jacksth.ru/award?keyword=angulos+complementarios+y+suplementarios+1+eso+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374359/normal_601586465e183.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390366/normal_5fe884ac7e359.pdfIn PDF document text
    • https://cdn.sqhk.co/sebutarukaw/ijDS0lH/terraforming_mars_player_mat_upgrade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369786/normal_6037aaf7cc1e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477864/normal_5fe80e276ba65.pdfIn PDF document text
    • https://cdn.sqhk.co/dusaradezat/bQzjejb/ben_10_tamil_movies.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418166/normal_5ff3a43d0ae2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473023/normal_602d5b8b3375a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365636/normal_5fe739bb500fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407299/normal_60415d947d8ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493917/normal_5fcce4b831597.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459780/normal_5fcd1b81207d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489033/normal_5fc99f786911c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501777/normal_6031e123ec591.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465263/normal_604ae5312a9d0.pdfIn PDF document text
    • https://cdn.sqhk.co/gipakegabav/8cgdljf/kindle_fire_apps_on_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413368/normal_6052b130ceb1f.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/hceiexk/40457705536.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422876/normal_6056d7a0260c1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://1628ddcf-e301-416d-9649-d9339b85441b.filesusr.com/ugd/0b1079_b8e2fccc50e940daa2dd760757c47415.pdf?index=trueIn PDF document text
    • https://4095172d-bd2f-4181-91d7-dd424e653400.filesusr.com/ugd/df73ab_320fcf47a53e4ccd8772f2753f22c0be.pdf?index=trueIn PDF document text
    • https://e4c06157-4c4c-4c30-848d-1ce07482e123.filesusr.com/ugd/99e070_bb75c572e9a64a5b835f80ca9d116b28.pdf?index=trueIn PDF document text
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_8f524a0e88d9431a8dbccbb8cac9cb37.pdf?index=trueIn PDF document text
    • https://a24bc4ef-4ee2-4fae-af0c-c9fea810b245.filesusr.com/ugd/67d96c_0eac8da2fcfc421fb237918cec6f3eef.pdf?index=trueIn PDF document text
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_c3fe9e9171f84dc2aebb0865e4dd32a3.pdf?index=trueIn PDF document text
    • https://baad1762-ad72-434c-be9a-9de7d8068d01.filesusr.com/ugd/61395f_c13436e54e1c41a2831f8f196191902c.pdf?index=trueIn PDF document text
    • https://f238abdf-92e3-4651-90df-65b6e8a648d9.filesusr.com/ugd/99965f_134fbb1c3a5d41c49930c71de6b421c7.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EB 5500 bytes
SHA-256: 61e37e76403352ef266772eb6f4c691f531689dffd32ed33aa096fe2aea9bd9c
font_01_sfnt_off00010396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10396 10484 bytes
SHA-256: 8b4f4f484a41c256a17b003fd585ae12150498c3f1a76eba16171214a6bdef7e
font_02_sfnt_off0001277c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277C 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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