Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e9cf80b6c00b85b…

MALICIOUS

PDF

74.7 KB Created: 2021-03-15 20:28:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1a21b7558d10e652098dfbdd3e45aebf SHA-1: 0e737679b05bac0e6c74e0a64c6842234a9129c2 SHA-256: 1e9cf80b6c00b85b094c10b0b0220486fc2a4b3e21ce06f62a57e734eb14f7ab
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as 'https://jottigo.ru/123?utm_term=naming+and+classifying+polynomials+worksheet', are likely used to redirect users to malicious sites or download further payloads.

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://jottigo.ru/123?utm_term=naming+and+classifying+polynomials+worksheet PDF link annotation
    • https://cdn.sqhk.co/xuvisisitinu/eBdijjj/arcade_fire_wake_up_video.pdfIn PDF document text
    • http://nakodinita.scienceontheweb.net/kefokerapola.pdfIn PDF document text
    • http://luxasireku.sportsontheweb.net/40002720062.pdfIn PDF document text
    • https://cdn.sqhk.co/nugofonavuf/havjbfn/girl_viral_video_today.pdfIn PDF document text
    • https://cdn.sqhk.co/letaziseb/jichsHd/kagogifiriwosikef.pdfIn PDF document text
    • https://cdn.sqhk.co/banamasuvaj/f7hbXSu/vuleru.pdfIn PDF document text
    • https://cdn.sqhk.co/bemememu/xaidjfY/oscar_wilde_death_cause.pdfIn PDF document text
    • https://cdn.sqhk.co/mapexovebo/jhnLGsS/56985393809.pdfIn PDF document text
    • http://jovefupe.mywebcommunity.org/taridozobiratifuluvi.pdfIn PDF document text
    • https://cdn.sqhk.co/lafixafif/BYihjce/download_zombie_sniper_shooting_3d_mod_apk.pdfIn PDF document text
    • http://dodajavux.scienceontheweb.net/jiwuvebowasuzad.pdfIn PDF document text
    • https://cdn.sqhk.co/lamiwifa/iftC0ii/xulezewuvemefabe.pdfIn PDF document text
    • https://cdn.sqhk.co/gujurolekuma/ghibgeK/four_in_a_line_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nibemodida.myartsonline.com/pobodopizez.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/fringe_complete_series.pdfIn PDF document text
    • http://xigokabuwawi.epizy.com/11864082871.pdfIn PDF document text
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_9c4aed88ac4b4929a8f71512909b5735.pdf?index=trueIn PDF document text
    • https://254a6a59-343e-4b7e-907c-c4819e171fff.filesusr.com/ugd/decf6f_683a15c337e74f3499ba380ecfdcd947.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/27209619272.pdfIn PDF document text
    • http://pibuluxe.rf.gd/tifoz.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_off0000e3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BF 5796 bytes
SHA-256: ff26b6de93268b531593f75576cb3ac6cb2cf2fb9c6ede962b9acb3084048bc1
font_01_sfnt_off0000f772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF772 11064 bytes
SHA-256: 2f7e29a8165fdff7d82279c8ed98e323292aa413511427bac217fa0dd7491d6e

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