Malicious PDF — malware analysis report

Static analysis result for SHA-256 32434eeb8fcbee82…

MALICIOUS

PDF

74.7 KB Created: 2021-05-11 09:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8bdb917b83d10d07922d14546fcad557 SHA-1: 1b43e91a31416130c00d3a5be7484e7e33f08cae SHA-256: 32434eeb8fcbee826151ed30f29fca2c3c9f4b3e97bb0f9510c56dc794167938
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics suggest it's designed to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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 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://botokaw.ru/strik?utm_term=how+to+remove+ge+oven+light
    • https://poteluteko.weebly.com/uploads/1/3/1/1/131164474/947281.pdf
    • https://pebetojakudasud.weebly.com/uploads/1/3/4/8/134879391/juzuwifekudapax-damitudazamapeg-viledikutiped.pdf
    • https://femidizori.weebly.com/uploads/1/3/4/6/134684525/66b6c0edc75a2.pdf
    • https://ribupawotomimam.weebly.com/uploads/1/3/4/6/134694318/4608005.pdf
    • https://miwunukeje.weebly.com/uploads/1/3/4/5/134524605/94610a9c845.pdf
    • https://faromemexe.weebly.com/uploads/1/3/5/3/135399009/4290571.pdf
    • https://static.s123-cdn-static.com/uploads/4485152/normal_5fe0032f5f22a.pdf
    • https://kotutoxegaru.weebly.com/uploads/1/3/2/6/132695780/kuvopik_xagubugubowijal_neromeme.pdf
    • https://suligabewe.weebly.com/uploads/1/3/4/0/134040343/gatesipuri_fokid_leronugas.pdf
    • https://static.s123-cdn-static.com/uploads/4497685/normal_6006daab8d1ba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/ladojenefe/tubaxizipinobinituk.pdf
    • http://fofilelajisemap.rf.gd/elite_daily_gift_guide.pdf
    • http://zaxukesaludu.epizy.com/14786252157.pdf
    • http://pimurif.rf.gd/31217382975.pdf
    • https://s3.amazonaws.com/legesiliv/addition_and_subtraction_of_vectors_class_11.pdf
    • https://s3.amazonaws.com/sesafefanulokam/bose_companion_3_series_ii_control_pod_replacement.pdf
    • http://rajifuxoral.epizy.com/urticaria_cronica_tratamiento.pdf
    • http://gisipusizen.rf.gd/54062415906.pdf
    • http://sofujupoxalup.rf.gd/chemistry_a_molecular_approach_solution.pdf
    • http://tidosanivowevez.epizy.com/95646852429.pdf
    • https://s3.amazonaws.com/gofiguj/clue_board_game_mansion_boardwalk_tracking_sheets.pdf
    • http://wirowobizofox.epizy.com/transistor_amplifier_types.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8d8.bin
aa14a84a2d249cc03c55fd02587387b753fe7ad90b961885a173bd290933b2fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D8 4824 bytes
font_01_sfnt_off0000f929.bin
3cb743c974712e6855958a0327113ef883ce4ec13b7967db795adf56741d4510		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF929 10716 bytes

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