Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e0aebacc1a100c…

MALICIOUS

PDF

80.2 KB Created: 2021-02-17 23:11:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a76d551c5d42bb911f9faefbb6b9a1b1 SHA-1: 6039070fbe9982e2a43585d90ff9f9efaf167e00 SHA-256: 42e0aebacc1a100c1052c2b95e0250c9b9a058204a533d1a721dbfea5c7904de
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting and redirector infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the nature of the embedded links and the PDF structure itself suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=gre+vocab+test+online+free In PDF document text
    • https://taxufutusa.weebly.com/uploads/1/3/4/5/134514166/wakegadupevago.pdfIn PDF document text
    • https://gozezitigaja.weebly.com/uploads/1/3/4/3/134340412/bujav.pdfIn PDF document text
    • https://feronokemafa.weebly.com/uploads/1/3/1/1/131164109/sivuworimomi_tutefifafugazum_nukoka_vukujov.pdfIn PDF document text
    • https://cdn.sqhk.co/makubeku/ihahihe/xosireletefefadodig.pdfIn PDF document text
    • http://airned.ru/5345849954937yft.pdfIn PDF document text
    • https://tujilebofali.weebly.com/uploads/1/3/5/3/135398949/vukuwojoxozewub-buvigusedubow-sadizozab.pdfIn PDF document text
    • http://fotodosajube.22web.org/famufatukadiliniga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ribibepope.epizy.com/65199776382.pdfIn PDF document text
    • http://juzefabamurever.rf.gd/rikesufif.pdfIn PDF document text
    • http://watavevolowun.epizy.com/41286617761.pdfIn PDF document text
    • http://xupanapil.epizy.com/free_4th_grade_spelling_words_worksheets.pdfIn PDF document text
    • http://nazewomufewe.rf.gd/75824405858.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/free_simple_land_purchase_agreement_form.pdfIn PDF document text
    • http://jemejuzot.epizy.com/75299432291.pdfIn PDF document text
    • http://nitusul.rf.gd/clash_of_clans_pc_windows_xp.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_off0000fb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB94 5108 bytes
SHA-256: bb08a06eb33898ee7ff73ac5df94b353e44c01ecad1867f00e8ec6cc85e2777b
font_01_sfnt_off00010d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D12 11092 bytes
SHA-256: cbfb91152a856d26c1a70c221cd934f0237141d9c6dbf1017d47b76626f83d3f

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