Malicious PDF — malware analysis report

Static analysis result for SHA-256 789a469c845fce09…

MALICIOUS

PDF

71.6 KB Created: 2021-01-20 10:52:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 277977915448dbad2955e041db9fd510 SHA-1: 7d60d270e1bf62ea356325b6c544e1e34c2389c4 SHA-256: 789a469c845fce099185e0abf25438d9becd0b972a9baf5611e1d7c5c26377b8
184 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, specifically 'https://yafferge.ru/aws?utm_term=bbbee+scorecard+2019+template'. The presence of multiple links on disposable hosting and the ML classifier's high confidence score indicate a deliberate attempt to lure users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/aws?utm_term=bbbee+scorecard+2019+template In PDF document text
    • https://site-1180194.mozfiles.com/files/1180194/game_bola_indonesia_liga_1.pdfIn PDF document text
    • https://site-1174961.mozfiles.com/files/1174961/integrated_mathematics_2_textbook_answers.pdfIn PDF document text
    • https://site-1173589.mozfiles.com/files/1173589/townsmen_premium_apk_no_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/vuritukupus/hfieifb/transfer_station_near_me_open.pdfIn PDF document text
    • https://site-1212128.mozfiles.com/files/1212128/69551779868.pdfIn PDF document text
    • https://cdn.sqhk.co/muligumixe/ejghbqE/widatijukinuw.pdfIn PDF document text
    • https://site-1084247.mozfiles.com/files/1084247/depujefobabakutozuvow.pdfIn PDF document text
    • http://www.thedti.gov.za/economic_empowerment/bee_sector_charters.jspB-BBEEIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fapaga/calorimetry_practice_problems_answers.pdfIn PDF document text
    • http://nazifaba.rf.gd/lozapatunanujufuwu.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/parsley_box_order_form.pdfIn PDF document text
    • http://xutulatovemi.epizy.com/85537663412.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/multipart_form_data_json_example_java.pdfIn PDF document text
    • http://meridupomosim.epizy.com/91288016880.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_off0000d862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD862 5888 bytes
SHA-256: c88f775b0206b7d6ba233220b162cc797739c84210b566b923761087bbebc521
font_01_sfnt_off0000ec52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC52 11004 bytes
SHA-256: 946a545e7e77404b6b8970143e0fd3fa229b8793a85622069dd721f17c2e98dd

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