Malicious PDF — malware analysis report

Static analysis result for SHA-256 15575eb0f4c230b1…

MALICIOUS

PDF

80.7 KB Created: 2021-03-09 03:50:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10bdd240e1c2d2c0c464a772e659a031 SHA-1: 5711cc23097dbd77cf988bb8bca4693a233ac5b5 SHA-256: 15575eb0f4c230b16ccfa5302550669bcde173cb7c3bd478cc04c242f556e0f2
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicative of a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a spearphishing attachment attack pattern 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/award?keyword=borders+railway+map+pdf
    • https://feruzizujuvete.weebly.com/uploads/1/3/0/7/130775768/5478849.pdf
    • https://cdn.sqhk.co/tipefimex/UhUieE1/69155025726.pdf
    • https://tepojaja.weebly.com/uploads/1/3/5/9/135966759/3776288.pdf
    • https://zesalogerevuj.weebly.com/uploads/1/3/4/6/134684883/xerikoje_firoke_muxomuzotixedej.pdf
    • http://gajonedorebuko.mywebcommunity.org/kasuniti.pdf
    • https://sujajikozodes.weebly.com/uploads/1/3/1/3/131384638/sunejojosozevi.pdf
    • https://tebeneka.weebly.com/uploads/1/3/0/8/130874559/geroxula-rofigesovutomib-faletediguf-dasaxipun.pdf
    • https://cdn.sqhk.co/dagosasojo/ibKjehi/43835075887.pdf
    • https://rasetakewalufil.weebly.com/uploads/1/3/6/0/136086978/milokibavupox-gujavosudaxen-mujuxixefef-lalotujilamuzi.pdf
    • https://fofosefekilom.weebly.com/uploads/1/3/0/8/130813764/naxux.pdf
    • https://dokakuzod.weebly.com/uploads/1/3/4/8/134884054/2666612.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zesafemumibow.myartsonline.com/the_night_manager_series_1_episode_6.pdf
    • http://kopixisaxet.epizy.com/38791711262.pdf
    • https://uploads.strikinglycdn.com/files/cf7e5db5-d24c-4130-8071-4bad9765ebce/xarasetezosimowosiwo.pdf
    • http://kazigolukujo.epizy.com/nitobalolaxizovufipisok.pdf
    • http://duvexarido.epizy.com/bagolobijasu.pdf
    • https://uploads.strikinglycdn.com/files/cbed5fbf-abbc-4c21-8d9f-9dbc2241eadc/is_eidl_grant_taxable_income.pdf
    • http://nibewisule.epizy.com/nuxokafuxaxawitivatiragiw.pdf
    • https://uploads.strikinglycdn.com/files/1ac17dd0-11aa-46a1-bef0-57246c2501df/brainpop_ell_free_trial.pdf
    • https://uploads.strikinglycdn.com/files/7fac6bc7-5ad0-487d-8673-93d7d4eb793e/ralph_waldo_emerson_transcendentalist.pdf
    • http://joriboka.epizy.com/ditoxilovuk.pdf
    • https://uploads.strikinglycdn.com/files/26b1514c-c100-482d-8e40-0e062c43e9f1/62069501779.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_off0000ff03.bin
55fb1756cdc1c0297c5fe3a9b941446cca695a8fe0d1bc9a2e4533869d6edeea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF03 5432 bytes
font_01_sfnt_off0001117e.bin
3c66cc67bb39d40d52358738d9ed32e6fe877b0c0a65842b4e1d6159c1bad06c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1117E 10476 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.