Malicious PDF — malware analysis report

Static analysis result for SHA-256 827832a92b8af81d…

MALICIOUS

PDF

79.4 KB Created: 2021-05-31 11:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: f27cefbc2e3da46ec973c494e4d1c480 SHA-1: 4af57bca683477a9154b67f0e974486656382ef8 SHA-256: 827832a92b8af81ded3cc8deca32a56359ad0993f89b0927768e505f080e9f7b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external links pointing to various domains, some of which are hosted on disposable infrastructure. The primary URL, 'https://fokemale.ru/strik?utm_term=can+you+add+apps+to+android+auto', suggests a potential phishing or SEO manipulation tactic. No scripts were extracted, but the structure strongly suggests the document's purpose is to redirect users to external, potentially harmful, websites.

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://fokemale.ru/strik?utm_term=can+you+add+apps+to+android+auto PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4406787/normal_5ffff7acf29ca.pdfIn PDF document text
    • https://pojixaguwor.weebly.com/uploads/1/3/1/4/131453565/kaginux-suvife-somekot-fegagivufupawi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401716/normal_5fc8e79f93c79.pdfIn PDF document text
    • https://jesemokomu.weebly.com/uploads/1/3/4/6/134687046/3e2d88042a5ffc.pdfIn PDF document text
    • https://fekoguto.weebly.com/uploads/1/3/4/4/134491689/7582988.pdfIn PDF document text
    • https://xiwiriled.weebly.com/uploads/1/3/4/8/134899872/lovovejokodimo.pdfIn PDF document text
    • https://xoxizanelanoruf.weebly.com/uploads/1/3/0/7/130740612/ledixik-pagagu.pdfIn PDF document text
    • https://xupubiwe.weebly.com/uploads/1/3/4/3/134339906/bded2c30.pdfIn PDF document text
    • https://nidozasa.weebly.com/uploads/1/3/4/6/134680612/tinodim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447437/normal_600148ad61091.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/d5156589-1254-44b2-9eac-264300577a22/weletofilupadafalurobep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/519e6b41-d789-4ff2-8f23-82a923163624/87001305331.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9374450-9d32-4cc7-92c3-692f59b039ea/introduction_to_project_risk_management_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e975e6a-5a48-4ae7-91ee-6e418e1e465b/whirlpool_dishwasher_not_drying_well.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5600870-907a-4ce2-a398-4f7fbd2ff092/57578738566.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d8a53df-eb73-4833-adf2-48ff703c73d3/36122161545.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09ef0787-ce23-460c-8d98-4479105477e2/english_grammar_class_12th_mp_board.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49db2f64-4eff-44e2-9ab5-689dd9a4eb87/zapoburamikopofolani.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d48b4da-bdc4-4c59-bc26-9f35842cad0a/lunchtime_results_for_22_august_2018.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_off0000faf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF8 4928 bytes
SHA-256: fd6f397f844a5da9c7b6dc43d7d6e1487b93423412733695892bd946d287121e
font_01_sfnt_off00010bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCD 10764 bytes
SHA-256: f5608f9bbe8fc7a7af5be37513e6ba38f0fd5c6d07ce0b2bbf3d447423ffed18