Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9dff30c5901e5ac…

MALICIOUS

PDF

76.1 KB Created: 2021-03-26 03:51:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f4573fd88bc0fde2a5d62c5a54fdb3cd SHA-1: 39062f95bc047f8d2fe61ae86e068f5d251b8ae7 SHA-256: a9dff30c5901e5ac3da683388b7c0065be2685edaaebdc564563a9ddaf14f540
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 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/123?utm_term=theraband+exercises+for+upper+body+pdf PDF link annotation
    • http://nunopasatipimav.medianewsonline.com/joselufeximujofiralewu.pdfIn PDF document text
    • https://cdn.sqhk.co/bujerinalo/aa2codR/puvilukukuzukixoguj.pdfIn PDF document text
    • https://cdn.sqhk.co/dogatefi/duieGHN/torijukurivunolonuvenop.pdfIn PDF document text
    • https://cdn.sqhk.co/medujebukoma/jighcnt/454_namahana_st_honolulu_hi_96815.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/9aqja3z/favekuwibawarexamege.pdfIn PDF document text
    • http://zovolexune.sportsontheweb.net/49483142911.pdfIn PDF document text
    • https://cdn.sqhk.co/govizanorev/hgDcghi/globe_top_up_games.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/Dvidgjl/android_nougat_32_bit.pdfIn PDF document text
    • https://cdn.sqhk.co/bekutojeke/gggi5bs/anime_couple_creator_doll_divine.pdfIn PDF document text
    • http://vomoliba.scienceontheweb.net/put_and_call_option_agreement.pdfIn PDF document text
    • https://cdn.sqhk.co/mojafefegamo/DyD1hhc/zaxazakemanaruxazidokugex.pdfIn PDF document text
    • http://pozufopajosel.mypressonline.com/digilamexa.pdfIn PDF document text
    • https://cdn.sqhk.co/jawuraxexije/hjgjTjj/red_warrior_needs_food_badly.pdfIn PDF document text
    • https://cdn.sqhk.co/fowipovoji/gw6hhct/85250512081.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sojaxub/que_harias_si_no_tuvieras_miedo_loreto_sesma.pdfIn PDF document text
    • http://dipuleragix.onlinewebshop.net/18999460467.pdfIn PDF document text
    • https://de74b992-0de1-402f-a2cc-438209b178b2.filesusr.com/ugd/2693ef_7550f06204554fa3969d919dad7a1acd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/zupisomofevulabezisusipi.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/expressvpn_chrome_android.pdfIn PDF document text
    • https://63aa7d51-6c54-48cc-ac87-b710a0da19c3.filesusr.com/ugd/c8d394_2aec557093e443f981481b7ea39368f8.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_off0000ec6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6A 5468 bytes
SHA-256: a7007782a73c4948d1a0a47e299bd77ec7c6497b5d8dd8335301c0b312015e4c
font_01_sfnt_off0000fefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFE 10628 bytes
SHA-256: f9234b267694f564d0c549787d4748366632f07ad42bc486522bbdb61da709d6

Open this report in the interactive analyzer, or submit your own file for analysis.