Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a5af2a80c3c623d…

MALICIOUS

PDF

80.6 KB Created: 2021-03-31 19:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0e7ba4b4f4273fcd113303200c48e799 SHA-1: cea7b74aee911d09ad48cbe14d62efb7370cdbcc SHA-256: 3a5af2a80c3c623d9efe75e0108f839a257f762eb72d6cf1c40e096080edd9db
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The primary URL, 'https://soxebez.ru/award?keyword=beyond+good+and+evil+by+nietzsche+pdf', suggests a lure related to a book search. Heuristics indicate this is a phishing and potentially malicious PDF, with ClamAV detecting it as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the structure strongly suggests a malicious intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://soxebez.ru/award?keyword=beyond+good+and+evil+by+nietzsche+pdf PDF link annotation
    • https://cdn.sqhk.co/kivipemo/hhjdhid/43068504625.pdfIn PDF document text
    • https://cdn.sqhk.co/zeputefilu/igifbhc/toserivamobanojiwelutaxas.pdfIn PDF document text
    • https://dorixakogika.weebly.com/uploads/1/3/6/0/136051108/mulowimegeruvuzutun.pdfIn PDF document text
    • https://zidivopopa.weebly.com/uploads/1/3/4/3/134373798/tadumo_zefagole.pdfIn PDF document text
    • https://cdn.sqhk.co/babijuvawov/57WFijZ/xuruzeweb.pdfIn PDF document text
    • http://jijezegovevogav.22web.org/ma6453_probability_and_queueing_theory_notes.pdfIn PDF document text
    • https://cdn.sqhk.co/lareduke/ciAgghj/xudigesoxego.pdfIn PDF document text
    • http://xojosagefe.22web.org/card_counting_blackjack.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/edee1371-2c2e-4206-9c8a-dad0997e6c23/kuverikorilobu.pdfIn PDF document text
    • http://vofefigekoloru.epizy.com/el_evangelismo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8add0755-c2f8-4dcc-8ccd-805119a66e0a/nepotufelo.pdfIn PDF document text
    • http://rupiroliwon.epizy.com/lavediko.pdfIn PDF document text
    • http://kisomelug.rf.gd/ejemplo_de_informe_sencillo_word.pdfIn PDF document text
    • http://vekifaxofezawe.epizy.com/22684396996.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61e23365-fc39-4ac7-b464-2a7442da99ce/does_water_flossing_replace_flossing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fedd9060-fc26-4e91-a096-83e9f0bb3aa7/lebodad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31f71dc0-448b-4ad3-95d3-e8a5fd6f32e2/bijonatutugo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28672efd-4d1e-4355-a8a2-87687a9b02ec/fubobajewomuwutemapube.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_off0000fbf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF7 5720 bytes
SHA-256: 03e6d6b317afd58a6b53a5cfafaf94e6cfe0bee6ef84307e66988acc5cf41495
font_01_sfnt_off00010f8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8A 11264 bytes
SHA-256: cff3ac2ce312fa4989de7b208589d6e88df4bf9e927a6409d177dfe76ade8dfd

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