Malicious PDF — malware analysis report

Static analysis result for SHA-256 f13bc0bd94016558…

MALICIOUS

PDF

75.6 KB Created: 2021-06-02 20:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 776039c2c463831d36e5fd2373833d37 SHA-1: 21d93d699025f49aca7d42c2a3bfb9ca6ffb3ac2 SHA-256: f13bc0bd9401655873353877ad317c11fefe88de017e1a42c926ca608f5e1b45
186 Risk Score

Malware Insights

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

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 URIs, many of which point to disposable hosting services. The primary URL, 'https://pixomot.ru/pbw?utm_term=foundations+of+psychiatric+mental+health+nursing+study+guide', suggests a potential SEO manipulation or phishing lure disguised as a study guide. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://pixomot.ru/pbw?utm_term=foundations+of+psychiatric+mental+health+nursing+study+guide PDF link annotation
    • https://wudegilunukoga.weebly.com/uploads/1/3/1/3/131379548/7362491.pdfIn PDF document text
    • https://duxevuwelinabim.weebly.com/uploads/1/3/4/3/134353564/fumifaxolo-mefedokamaw-jegekem-sazutigozazu.pdfIn PDF document text
    • https://sulumakopata.weebly.com/uploads/1/3/0/7/130775191/vilopama-pulisewadobe.pdfIn PDF document text
    • https://kugovowakewel.weebly.com/uploads/1/3/4/0/134040427/bbf3a1fe51a.pdfIn PDF document text
    • https://bazojosazim.weebly.com/uploads/1/3/6/0/136086377/nusarefixo.pdfIn PDF document text
    • https://jaxuvoxet.weebly.com/uploads/1/3/5/9/135979876/kipixipavaw.pdfIn PDF document text
    • https://gogebuzavoriro.weebly.com/uploads/1/3/2/6/132681212/xaxurume.pdfIn PDF document text
    • https://xezolemi.weebly.com/uploads/1/3/5/3/135324657/nabatapupip-pijenefafumis-salovogomoseze-relorerej.pdfIn PDF document text
    • https://xokaxoluxiw.weebly.com/uploads/1/3/5/9/135977396/fc57c865b6728e3.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/69502a49-0114-4931-9667-06d78d447e8e/81189625948.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2465697c-cb64-4ded-891f-bb0b013c2a12/wagepobibatolaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcf2561c-42fb-4d15-ae86-317db87008c1/will_ahsoka_be_in_the_mandalorian_more.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63a536be-38b9-43a3-91a1-ac8bb82ee116/ca_residential_lease_or_month-to-month_rental_agreement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42d0227e-a1f7-41db-be8c-61ffe8bd4e90/how_to_increase_my_sex_power.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/098235c4-bf15-4817-aca0-3a3ae2be0bd5/rusemedusiwakodugudug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf108e34-9aa2-4be5-bc62-bd4284b90ad1/wildgame_innovations_terra_extreme_12.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4ff5b7d-579f-4f11-8ed9-60f50678b801/how_wide_is_a_2000_ford_ranger_bed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f13820cd-1503-467c-a0c9-0eed946a5d4b/47134150818.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7d5425d-c872-4409-94cd-93d2a14aaccb/online_book_store_template_html.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75dcc3d8-6b2d-42a2-82b1-55375e2da9fd/cajas_de_carton_chapter_1_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c61ab0ed-8623-469a-9d49-4718cb112a13/36421253298.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cd48294-3375-4a57-a133-af4305b0345b/what_do_alchemy_symbols_mean.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_off0000eace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACE 5628 bytes
SHA-256: 26786610c037e47c59977a7ff62b20eee79d526592664d181831e3c27c716dff
font_01_sfnt_off0000fdd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD3 10064 bytes
SHA-256: 78f2069b3b6ea8e61f9f1db128d842e09293b5b49c397f43deadd22ebe446a65

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