Malicious PDF — malware analysis report

Static analysis result for SHA-256 9935f70bf213808e…

MALICIOUS

PDF

78.6 KB Created: 2021-03-01 04:59:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2cd3460c269ae7a64a26a4388347e274 SHA-1: bea57e12c284360bac33083f480c5379e7f8a872 SHA-256: 9935f70bf213808e15babfbb9f36adb9c668f5f82785b9d25302cb73dfdf794e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

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://soxebez.ru/strik?utm_term=can+you+whitewash+pine+flooring PDF link annotation
    • http://nafarami.medianewsonline.com/network_security_engineer_cv_sample.pdfIn PDF document text
    • http://gsmall.space/67223853396rbexa.pdfIn PDF document text
    • http://kamikofonem.mygamesonline.org/sulis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412762/normal_603c19e14a1f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478378/normal_5fe33146708f5.pdfIn PDF document text
    • http://pupezawat.scienceontheweb.net/fitbit_charge_hr_2_leather_band_large.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478951/normal_601c914e59388.pdfIn PDF document text
    • http://nowukusox.mypressonline.com/the_bfg_movie_trailer_2016.pdfIn PDF document text
    • http://cocobeautybar.ca/xobekewqzzp3.pdfIn PDF document text
    • https://cdn.sqhk.co/vabadoma/hhpibMH/pixel_gun_3d_unblocked_no_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/winumigutam/butterfly_hd_wallpaper_for_android_mobile.pdfIn PDF document text
    • http://wolobugoxew.myartsonline.com/30151507271.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/sovazorujerebonot.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D2 5260 bytes
SHA-256: a866a2cee64ad0e1639e63868c78647a30f396ab181afa7631c7c534c1171936
font_01_sfnt_off0000fbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD2 10568 bytes
SHA-256: 06686071b71975e9172e594925faec255228c83743687732156ffc0185d7f505
font_02_sfnt_off00011ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF3 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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