Malicious PDF — malware analysis report

Static analysis result for SHA-256 a638bd1a7ef74c6a…

MALICIOUS

PDF

68.3 KB Created: 2021-03-09 02:58:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 509c89c1223180adbdb36050e4859f8b SHA-1: 96f08828019f68c2eaab5fbbd3f3564d6c84e1b3 SHA-256: a638bd1a7ef74c6ab85e7bc3dd75f49814fc9527d3d72888a40ff9f9108ff5f0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and one specific URL is presented as a lure disguised as search results for song chords. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site.

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
  • 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://jumiwimov.ru/strik?utm_term=your+grace+is+enough+matt+maher+guitar+chords PDF link annotation
    • http://geesecam.com/puxofetitolabifocm571.pdfIn PDF document text
    • http://mowefopovog.mywebcommunity.org/debotofibusibe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417213/normal_600dd26ad44e8.pdfIn PDF document text
    • http://nigasheff.xyz/manual_variador_microdrive_elitec1b5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422620/normal_602e2effd955e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465941/normal_60364fa282f39.pdfIn PDF document text
    • http://mosuxuvemuzuwex.mywebcommunity.org/how_to_clear_memory_on_hp_officejet_pro_8620.pdfIn PDF document text
    • http://vugekowuzujed.scienceontheweb.net/poxudubezafevariseveluvo.pdfIn PDF document text
    • http://netekepipavosis.sportsontheweb.net/duxuzobolafapiselaju.pdfIn PDF document text
    • http://rowowevu.mypressonline.com/56820929508.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/nowimumibagej.pdfIn PDF document text
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_a1221f51c84946379b8adf1c77f906d1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/south_african_leave_form_template.pdfIn PDF document text
    • https://4253c66a-660d-4c83-b31d-f715833d547b.filesusr.com/ugd/d9e9a0_1500bff138104030bf63efd193586256.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/84674842110.pdfIn PDF document text
    • https://7a9095e9-4ba3-4ff7-9406-a75d0382ce8a.filesusr.com/ugd/db93e9_b605c57e1dc94f159530e7186b316d0a.pdf?index=trueIn PDF document text
    • http://tafiwepamubov.atwebpages.com/gumivasekud.pdfIn PDF document text
    • http://tuxabatadifu.onlinewebshop.net/37261632347.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_off0000cf29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF29 5284 bytes
SHA-256: 75a1de52ca9480c294a6f54c0be1624e1bdb9d9ec29fa903817f765a41e9328c
font_01_sfnt_off0000e0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F4 10224 bytes
SHA-256: 7d16fe9b9d4555a76129e9725a7a927de63ada25c5b1e5076233283301d89a26

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