Malicious PDF — malware analysis report

Static analysis result for SHA-256 e70babe693d44072…

MALICIOUS

PDF

84.4 KB Created: 2021-09-16 14:25:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 23a122632d7040eb57f576f93d82d7f1 SHA-1: d8dacaec3757e0f6c5d0f48e71aab35f1b7c2214 SHA-256: e70babe693d44072c16e1768ae6b2d26730eaa8d620508dd0498be5a2b75779c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external sites, many of which are structured as link farms for downloads, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or a trojan delivery mechanism. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=pubg+mobile+1.2+apk+download PDF link annotation
    • http://megaprestige.ru/uploads/files/luvuputemox.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/96487672867.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/37223913680.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/94068094887.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/xunosazumanizazipazu.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/16990163053.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/mafutofuwagexot.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/48925160680.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/16643270453.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/ziporoliduvabuxe.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/98177674383.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/wawajijigaxemugonoj.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/60065017285.pdfIn PDF document text
    • https://schmitz.cz/res/file/webizegedoteno.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/fasososutenunanu.pdfIn PDF document text
    • http://progetec.org/userfiles/files/87978223978.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/zaxetuwapugulobapuruzozi.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/93077295314.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/wejogofelorukurufapa.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/rejuxowe.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/52137622471.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/95798232022.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/70427868931.pdfIn PDF document text
    • https://scalper.ir/data/files/file/34823901800.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E2 19088 bytes
SHA-256: c49ec214bdc00ac8df64b2a4dcb2d987609f55f7a4ae264e3aedb9102111a394
font_02_sfnt_off00012a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8E 11028 bytes
SHA-256: 0bf42a61c85416115a617b544fff95b74a1a30af5dba9e1a2752304dcdcb5307

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