Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ad0bb08816b5af8…

MALICIOUS

PDF

76.8 KB Created: 2021-03-08 20:21:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 530390e8243e757178a155e2fa44d5fe SHA-1: b2e30c96800e02627afcbec9a10b972b28cd4035 SHA-256: 9ad0bb08816b5af876314a46e4e15c9f05f6e2cce6ad8d66671a2b9e186ae71d
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and link farms, strongly suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://fokemale.ru/123?utm_term=nrich+maths+ks2+worksheets PDF link annotation
    • http://mstmail.space/xenifumovifawudenosea6ycc.pdfIn PDF document text
    • https://cdn.sqhk.co/ronofumito/Sbuijgc/ripizidogijavetutot.pdfIn PDF document text
    • https://muzuxagofonokow.weebly.com/uploads/1/3/1/4/131406885/zuvutijupikipef.pdfIn PDF document text
    • http://ita-women.space/java_complete_reference6r0ht.pdfIn PDF document text
    • https://cdn.sqhk.co/rarukaboz/ji1iejg/wijaniriginitop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410674/normal_60379ac1f1839.pdfIn PDF document text
    • http://ecoservice-vlad.ru/32375043368xto70.pdfIn PDF document text
    • https://cdn.sqhk.co/pemazekefise/6bhCCqf/pink_and_grey_world_map_wallpaper.pdfIn PDF document text
    • https://xalekosud.weebly.com/uploads/1/3/5/3/135350534/7f791949cf38c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474191/normal_5ffb903448403.pdfIn PDF document text
    • http://kovemiwixipogaf.66ghz.com/gibavidigog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366995/normal_6012db94355cd.pdfIn PDF document text
    • http://safetymirrors.xyz/get_bitmap_file_size_android3dxof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379855/normal_60011390562db.pdfIn PDF document text
    • http://bitcoinov.site/how_to_program_directv_remote_to_genie_mini_rc733xpv4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486351/normal_5fcb3aa135475.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jarunotaso.rf.gd/new_battle_royale_games.pdfIn PDF document text
    • http://natomilalusirof.rf.gd/98053421943.pdfIn PDF document text
    • http://vimobuzu.epizy.com/89100903415.pdfIn PDF document text
    • http://vepilezora.epizy.com/sbpdcl_payment_receipt.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_off0000f0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E0 5264 bytes
SHA-256: 1c52c26c84f2e6abecad3b94bce4b9c1e1c1fd04de2350266da082d6ad8011f3
font_01_sfnt_off000102ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AE 10300 bytes
SHA-256: 41509734d55ac4e12ead875c06b75f9db72a84a439c833a47116dbd9f8e70430

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