Malicious PDF — malware analysis report

Static analysis result for SHA-256 e804dff201f9747a…

MALICIOUS

PDF

74.9 KB Created: 2021-04-11 08:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: afef21120a37cea8956f65b6d0bf3e1d SHA-1: 7605dc9859acaa1233a1a4e3110ec72c79561eef SHA-256: e804dff201f9747a2353c083304d7d26b875e57b55a28c1d53ef105ec4491c82
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URLs and the nature of the heuristics strongly indicate an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/strik?utm_term=hoover+spinscrub+not+suctioning PDF link annotation
    • http://futup.ru/mata_ke_bhajan_video_meinjb8uq.pdfIn PDF document text
    • http://beremoter.online/pictographs_worksheets_5th_grade6clf4.pdfIn PDF document text
    • http://saroforati.medianewsonline.com/pajifelus.pdfIn PDF document text
    • http://5-euro.info/nopelu3vsj8.pdfIn PDF document text
    • https://vanimiravupu.weebly.com/uploads/1/3/2/7/132710567/moresaloni.pdfIn PDF document text
    • https://zavowije.weebly.com/uploads/1/3/2/6/132680855/kuwajoloxo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460970/normal_5fe259e3229ea.pdfIn PDF document text
    • https://wupixizot.weebly.com/uploads/1/3/5/3/135398135/jeparatisemodo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401694/normal_5fee4711bf986.pdfIn PDF document text
    • http://egosikenclub.com/warhammer_total_war_2_lizardmen_campaign_guidec3968.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411481/normal_6000d56e55dae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461211/normal_60345f1e9753d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415745/normal_6035aa5c1ef0d.pdfIn PDF document text
    • http://xuribof.medianewsonline.com/regomumiguganasosisigiz.pdfIn PDF document text
    • http://juilopkiretlo.ru/21781227963gwuli.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://uploads.strikinglycdn.com/files/662eeb5f-4071-4a8e-9e4a-0848cdc30475/xupuwiresolivoko.pdfIn PDF document text
    • https://7c9e9c40-2b96-4f88-8065-b5ff5e495659.filesusr.com/ugd/3bfcae_e780cda0642c4c4986961c8e50ff98d7.pdf?index=trueIn PDF document text
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_116041798281474f8aecd0b991c479d5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c5dc3d9-0786-4cb0-84f6-e3e7e504b423/tifivozivoj.pdfIn PDF document text
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_b2fe4cad9b3f4f35ae58840dee5c71ec.pdf?index=trueIn PDF document text
    • https://7ec9ed57-df89-401a-953b-45744c150cee.filesusr.com/ugd/6e3131_77ced9f58335417a9ed26ce200122e97.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_off0000da7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7A 4904 bytes
SHA-256: 31ea8e57c93c4136bf19b53f8816553866abe98d40ed2883dbd193e5b2e8fe68
font_01_sfnt_off0000eb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3A 10700 bytes
SHA-256: e5f55ca39c1045b5dfef0881f82a1a922f6808802f12bd265445c734d53f5a14
font_02_sfnt_off00010ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF9 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e