Malicious PDF — malware analysis report

Static analysis result for SHA-256 535720a978dddbdb…

MALICIOUS

PDF

61.9 KB Created: 2021-02-09 01:04:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: fc68ebb52e7553b60b7a8c302fcf0e4d SHA-1: 15d5d9df37ebcd835604c2f6122a85085fc45b81 SHA-256: 535720a978dddbdbfcc9076e82c43e0939bbe9c185ddf0cbc45116edeff76c92
226 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://seumenha.ru/123?utm_term=psychology+concepts+and+applications+4th+edition+pdf PDF link annotation
    • https://lawukexudemodu.weebly.com/uploads/1/3/4/0/134041757/zudezowomi-paburefade-bezirewana.pdfIn PDF document text
    • http://pink-echo.club/148728466873qcmd.pdfIn PDF document text
    • https://cdn.sqhk.co/joxezexukub/ijaqjig/11900096786.pdfIn macro / runtime command snippet
    • https://cdn.sqhk.co/suwajipufo/jc1L7if/sausage_day_game_for_free_download.pdfIn macro / runtime command snippet
    • https://cdn.sqhk.co/tumupowe/ajcVsii/52205202603.pdfIn macro / runtime command snippet
    • https://cdn.sqhk.co/javukapegami/ihatZjg/hokey_cokey_lockdown.pdfIn PDF document text
    • https://kuxevirajopar.weebly.com/uploads/1/3/5/9/135990570/xetepe-zakifola-pogekipasuratu-vofakel.pdfIn PDF document text
    • https://nejotadig.weebly.com/uploads/1/3/1/1/131164569/lumivefutuxomorad.pdfIn PDF document text
    • https://vonepegoparopew.weebly.com/uploads/1/3/4/3/134352316/wozexijurop-dipikubekelo-suvuvifugese.pdfIn PDF document text
    • https://wisukasef.weebly.com/uploads/1/3/1/4/131453855/be487.pdfIn PDF document text
    • https://rowegodidevonu.weebly.com/uploads/1/3/4/4/134468430/jasiwonam_wezalaka.pdfIn PDF document text
    • http://detonic-ordina.website/degogufofoy5dpv.pdfIn PDF document text
    • https://fujulisu.weebly.com/uploads/1/3/4/0/134042697/4866a93c58c37.pdfIn PDF document text
    • http://okstore.info/marshall_hgtalare_stockwell_manualww9qh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pegek/43982895435.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_off0000b5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E8 5512 bytes
SHA-256: 480ba5f09861a2e8daa25d7cf848946080220a1415e73365db794b44272a5c45
font_01_sfnt_off0000c8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BF 10032 bytes
SHA-256: dd315964381fbeb4cf8e461d291e97d5409a174ffcfad76ae1c9806ff9385ad5

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