Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2d19e6aeecd3c24…

MALICIOUS

PDF

72.9 KB Created: 2021-06-04 09:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 509cac39c4581c86d525c2bdc3a958c5 SHA-1: 5875d1cf96a9c844a6a6482ba9850ba154299894 SHA-256: f2d19e6aeecd3c24e6c268a8156fd3b9014ee108c33b21157660059e45dbe604
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://inwebjor.ru/pbw?utm_term=acer+spin+5+not+turning+on PDF link annotation
    • https://widafesisitix.weebly.com/uploads/1/3/5/3/135321065/5f7df.pdfIn PDF document text
    • https://titepusigob.weebly.com/uploads/1/3/5/3/135392267/1816413.pdfIn PDF document text
    • https://ravuripuzi.weebly.com/uploads/1/3/5/9/135958818/xovenopedol_zapogadefexafu_tiwanoguxep_wujebutovo.pdfIn PDF document text
    • https://rizizisexulap.weebly.com/uploads/1/3/1/4/131407181/3f8acd42310dbf8.pdfIn PDF document text
    • https://sivagodumojuji.weebly.com/uploads/1/3/4/2/134235915/bagovevivadafemev.pdfIn PDF document text
    • https://gibunuvupu.weebly.com/uploads/1/3/4/7/134746488/4319111.pdfIn PDF document text
    • https://mufuxavezefajox.weebly.com/uploads/1/3/4/4/134497947/3828981.pdfIn PDF document text
    • https://nagafibujur.weebly.com/uploads/1/3/4/5/134514283/vuxod.pdfIn PDF document text
    • https://katutufoderosut.weebly.com/uploads/1/3/1/4/131437544/3496808.pdfIn PDF document text
    • https://guzesunidami.weebly.com/uploads/1/3/0/8/130873942/5351800.pdfIn PDF document text
    • https://nesojusoxo.weebly.com/uploads/1/3/4/6/134631750/joxujexedevosu-fefag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dagomiwavi.pbworks.com/f/somewhere_over_the_rainbow_sheet_music_israel.pdfIn PDF document text
    • http://kolasotosexu.pbworks.com/f/sipigafe.pdfIn PDF document text
    • http://xixokuzujoz.pbworks.com/w/file/fetch/144427233/apex_legends_aimbot_ps4_download.pdfIn PDF document text
    • http://ropotupi.pbworks.com/f/54726538184.pdfIn PDF document text
    • http://fotikeralo.pbworks.com/f/42373927007.pdfIn PDF document text
    • http://zilebunod.pbworks.com/w/file/fetch/144426165/60502765618.pdfIn PDF document text
    • http://padimagofo.pbworks.com/w/file/fetch/144481068/gazesaketasekaduporag.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_off0000e26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26D 4972 bytes
SHA-256: 07f16101a61aab101873f37baefe50d8b840e21590a11ffa88931280da45a2e5
font_01_sfnt_off0000f372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF372 10296 bytes
SHA-256: 78ee5dd31ece6ee65013c1acf21add299ca8cb600360bf2e0e1e7f001e438fcc

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