Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf6e27afc732bd1f…

MALICIOUS

PDF

62.5 KB Created: 2021-02-24 06:13:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3f50f21634dacd929094ab98d203aee5 SHA-1: d2a22f66678e5764d86a43c912e27ee23fdbbf41 SHA-256: cf6e27afc732bd1f985e87f64926ae7259ad6604132381c180f86a544d0aec71
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to disposable domains and known malicious redirectors, indicating a phishing or malware distribution attempt. Heuristics confirm the presence of malicious redirector links and a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=mass+media+law+19th+edition+pdf In PDF document text
    • https://kaxogirigajel.weebly.com/uploads/1/3/4/6/134611066/mifuruwub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392215/normal_5fe07ce5aa87c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446162/normal_602e0c63c691f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379048/normal_601298681d272.pdfIn PDF document text
    • http://zoom-omsk.ru/hand_operated_capsule_filling_machine_standard_operating_proceduregcx7e.pdfIn PDF document text
    • https://cdn.sqhk.co/zurajekiviw/ihcomif/unblocked_games_red_car_2.pdfIn PDF document text
    • http://vpntop.info/what_happens_to_my_kindle_books_if_amazon_goes_out_of_businessk9z7g.pdfIn PDF document text
    • https://dezilitew.weebly.com/uploads/1/3/4/7/134728488/5641093.pdfIn PDF document text
    • https://nugobobunebiset.weebly.com/uploads/1/3/5/3/135303429/jikipiwapa_josososum.pdfIn PDF document text
    • https://tojemiwavujiguv.weebly.com/uploads/1/3/4/4/134468879/depimozovatolik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374859/normal_601cd7bf32260.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404103/normal_6013a5d1129a5.pdfIn PDF document text
    • https://cdn.sqhk.co/nusatabi/dkgdjfi/80927738279.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408871/normal_5ff9ea515d6a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458824/normal_5fee1069e2460.pdfIn PDF document text
    • http://povar2020.site/muzofumv3uzb.pdfIn PDF document text
    • https://cdn.sqhk.co/wezokobuli/Tggihek/60850785479.pdfIn PDF document text
    • https://fejunula.weebly.com/uploads/1/3/4/3/134363834/favabezovezu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480149/normal_5ff14085162d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371524/normal_5fe2ccd0aeb8f.pdfIn PDF document text
    • http://bio-ita.fun/sinanubawdwph8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000b6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6FA 5488 bytes
SHA-256: 5001759c1ddf153a5b33d40c5718952fa0a616cc99cc33e2f9bc864476e39ab0
font_01_sfnt_off0000c9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A3 10340 bytes
SHA-256: 5206b3f2cbdf46595d0be6388b8c694cd4829f65e267c218aef599d5093869ae

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