Malicious PDF — malware analysis report

Static analysis result for SHA-256 faf9d8ecaaa7cbf0…

MALICIOUS

PDF

73.0 KB Created: 2021-05-08 15:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 9975825772004e30684681877c51e0a3 SHA-1: c9d481bf1c764290790547eed1f88b6d534d933a SHA-256: faf9d8ecaaa7cbf0a457b514b58646083a905b01b4c7e6f5922ab50bd9927fdf
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/strik?utm_term=cisco+catalyst+2950+release+date PDF link annotation
    • http://girepodemaz.getenjoyment.net/bisofidevexagijo.pdfIn PDF document text
    • http://buloshnaya.site/96607849112o8k29.pdfIn PDF document text
    • https://cdn.sqhk.co/sojejinof/hecJthc/gamecube_yellow_plastic.pdfIn PDF document text
    • http://doordash.link/dofuzoxkv41.pdfIn PDF document text
    • http://tiwimifozukimu.medianewsonline.com/27688004073.pdfIn PDF document text
    • https://cdn.sqhk.co/jimikafede/cthagcR/dialer_apk_for_android_4._4._2.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/ihjdgjc/boxcryptor_web_login.pdfIn PDF document text
    • https://cdn.sqhk.co/zajikeze/jiejaoF/part_of_your_world_flute_sheet_music.pdfIn PDF document text
    • http://justiciaforjustice.com/degrees_and_radians_worksheet_answers2sfd1.pdfIn PDF document text
    • http://lazategomid.scienceontheweb.net/zewulibebutilomikatusi.pdfIn PDF document text
    • http://dasiwujupuna.sportsontheweb.net/super_mario_land_3_super_nintendo.pdfIn PDF document text
    • http://xijulefabogi.getenjoyment.net/how_much_does_a_bobcat_cost_per_hour.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/sTFbjdx/small_business_accounting_courses_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1ba6f066-89d4-4445-b8a9-08a6de046ef2.filesusr.com/ugd/d40554_df4aba4ec2424b4c923669cdb265a585.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb09ab34-bc90-45f6-864c-26dd4c223805/my_where_i_come_from_kane_brown_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38823c81-2d21-4c35-b35c-7de9c596b125/zelavedimeputokuroger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/068e79fa-e9ff-42ea-b0b7-1847eb9f2478/73093682988.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbdb3fd2-8909-4b1f-b805-1b231221feaa/96009598884.pdfIn PDF document text
    • https://add83a7c-0e31-48b3-928b-061d82ba9144.filesusr.com/ugd/205ae4_2c927cc654064743984ac268862fee10.pdf?index=trueIn PDF document text
    • https://451b78f8-089e-4d4d-bc4b-60abb621f7e6.filesusr.com/ugd/7ef0dc_67c18dac67eb477c8cc30ee37147e20c.pdf?index=trueIn 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_off0000df6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6B 5496 bytes
SHA-256: 12760296db625c0c9af40f72638aa379fd4ab7415ede4cb21c76705d7abf3d24
font_01_sfnt_off0000f22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22E 10820 bytes
SHA-256: 277eae5c433d2c0a7948c19b7a17deb7440d2a717162baf6fc4f3bfcfdae5f0c

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