Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2aec7179dbcb9ac…

MALICIOUS

PDF

84.6 KB Created: 2021-02-22 07:42:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ef6de65a9945d9513fe0df5fc1e19814 SHA-1: 3df31b250c9b8dcbe9c1a62039a6b5c9e04a169f SHA-256: a2aec7179dbcb9acf03902ff73bda806eb0e5927a1ca3afe972d6fa861a163ae
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a link farm on disposable hosting. The embedded URL `https://jottigo.ru/strik?utm_term=the+standard+enthalpy+change+of+formation+of+ethanol` suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious intent, likely to redirect the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/strik?utm_term=the+standard+enthalpy+change+of+formation+of+ethanol PDF link annotation
    • https://cdn.sqhk.co/koxuvusu/mc2gfib/99565102886.pdfIn PDF document text
    • https://widafesisitix.weebly.com/uploads/1/3/5/3/135321065/43df190043.pdfIn PDF document text
    • http://bomezifubaf.iblogger.org/ask_and_it_is_given_scripture.pdfIn PDF document text
    • http://xekepova.iblogger.org/67767411753.pdfIn PDF document text
    • https://cdn.sqhk.co/pixorikibam/hgCigjj/sufogajitodokotaser.pdfIn PDF document text
    • https://cdn.sqhk.co/joxufejod/hieCibs/simcity_buildit_hack_tool_download.pdfIn PDF document text
    • https://cdn.sqhk.co/mijajijem/iiPyEJT/iphone_x_ringtone_free_download_high_quality.pdfIn PDF document text
    • https://cdn.sqhk.co/zidenesek/RKGLiid/big_boy_cartoon_images.pdfIn PDF document text
    • https://cdn.sqhk.co/fatidizeru/hhLTtCt/earthquake_map_san_andreas_fault.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://naxosavor.rf.gd/47263121199.pdfIn PDF document text
    • http://robinovedibepo.epizy.com/crafting_and_building_apk_android_oyun_club.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/kobew.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/85766833137.pdfIn PDF document text
    • http://fipotunisobojow.epizy.com/pexixux.pdfIn PDF document text
    • http://womutefipile.epizy.com/latest_windows_10_pro_iso.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/tujujo.pdfIn PDF document text
    • https://s3.amazonaws.com/pekatikisuruki/filmywap_2018_bollywood_movies_kabir_singh.pdfIn PDF document text
    • http://moborudazijom.epizy.com/australia_visa_application_form_sample.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_off000107f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F2 5620 bytes
SHA-256: d09802bfde308b82d7fb41110ed3959b9b2c64760968d796fe980bb5837617d1
font_01_sfnt_off00011af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF2 11788 bytes
SHA-256: adb77958ad20f06ac8398c1f87a141b98a3f7f7502dbf98f481c8a51a70fcf69

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