Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0ef4db69490227a…

MALICIOUS

PDF

132.1 KB Created: 2021-03-24 03:36:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a9723ad82b8ec2c52ad6c786ae9827e8 SHA-1: 15ff8da9fc29c685e7599504d1ab5c6e2729b4da SHA-256: a0ef4db69490227a2e13a9dc90220563343f8541b350f92263f156acdd09c75c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious sites. The presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://fokemale.ru/strik?utm_term=cypher+system+foci PDF link annotation
    • http://nikaold.site/suxegukcnv5.pdfIn PDF document text
    • http://politach.com/vemegemevemizonadomoraxem5g767.pdfIn PDF document text
    • http://nibakelenixezas.getenjoyment.net/nursery_rhymes_for_babies.pdfIn PDF document text
    • https://cdn.sqhk.co/zebimapajod/bjgjdia/the_cw_app_download_ios.pdfIn PDF document text
    • http://pomurofame.iblogger.org/99008315646.pdfIn PDF document text
    • http://excellent-spb.ru/extent_report_4_jar4snoi.pdfIn PDF document text
    • http://nazhivy.net/44918919810jba4.pdfIn PDF document text
    • http://wugupomovupa.sportsontheweb.net/xukokudefisapowasokop.pdfIn PDF document text
    • http://recepty-dd.info/what_are_the_duties_of_safety_officer_on_boardb02z4.pdfIn PDF document text
    • http://zitirisiz.mywebcommunity.org/bls_study_guide.pdfIn PDF document text
    • http://rigares.iblogger.org/shogun_2_guide_shimazu.pdfIn PDF document text
    • http://tersq.fun/budupeseteujd2k.pdfIn PDF document text
    • https://cdn.sqhk.co/lilapanorup/iipjgBT/hume_bank_wodonga_contact.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mawekipabotore.epizy.com/nizamotitinawidogit.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/elgar_nimrod_organ_sheet_music_free.pdfIn PDF document text
    • http://jeropufa.epizy.com/45989197319.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/what_are_the_first_principles_of_logic.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/91537656970.pdfIn PDF document text
    • http://gaxomilajow.epizy.com/fabric_of_the_cosmos_brian_greene.pdfIn PDF document text
    • http://xufolat.atwebpages.com/the_acquisitive_society.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/addressing_modes_of_8085_microprocessor.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_off0001cc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC72 5020 bytes
SHA-256: a05806151214947cd89a6ddae7df22541a7dbd1f9333e476e9f3871431280488
font_01_sfnt_off0001dd68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DD68 10972 bytes
SHA-256: ef04880ee9f67177c6a2871905eaae60a3891060fae75b52aec8fbf255b2bbac

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