Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ad6763a3af410d6…

MALICIOUS

PDF

97.3 KB Created: 2021-04-17 08:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 60ca8078150ff012d74c0a9dc29cc390 SHA-1: c6d80ceba624ec8656d1dbe7e675616b116cac55 SHA-256: 7ad6763a3af410d659b2bd11edfec463b2d9753ab6e9762d8b6236115aa23da3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9999

Heuristics 5

  • 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 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=sql+database+administrator+salary+in+india PDF link annotation
    • https://cdn.sqhk.co/wugolekufo/hbghshe/rojitufejonirelobirunoxa.pdfIn PDF document text
    • https://cdn.sqhk.co/zimidenex/Che07ic/dawobudevilep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413976/normal_605c28a273a66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414353/normal_606372e1d80f0.pdfIn PDF document text
    • https://cdn.sqhk.co/rufadexu/djgxJjf/81041142190.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446512/normal_603a4fe334499.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/wnidRhi/happy_wheels_demo_unblocked.pdfIn PDF document text
    • http://immorta-cross1.club/55629447146242nh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416149/normal_6034f13a2380f.pdfIn PDF document text
    • http://sokfresh.fun/91756090066sg3pi.pdfIn PDF document text
    • http://healsmall.space/brewster_ghiselin_the_creative_process3163u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459034/normal_6041911a17089.pdfIn PDF document text
    • https://cdn.sqhk.co/zosurinipin/ijchigi/music_ringtones_galaxy_free_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/pesegozod/jbojhiw/fiwawum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419191/normal_5fe150205c22e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462986/normal_6052286f8c4f8.pdfIn PDF document text
    • http://vumexovuvelafe.medianewsonline.com/resume_format_for_accountant_freshers.pdfIn PDF document text
    • http://sugameloxufe.mywebcommunity.org/45788659807.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00013e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E16 5440 bytes
SHA-256: 9661b657ca6654ab624d4f658555b824cb9e4e21fdd2594a77ff06debcdc9fb1
font_01_sfnt_off0001507e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1507E 11576 bytes
SHA-256: 962b399bd6555d966a5311399a64303a7f63ee40f4db72d31762627d26a64a98