Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd66fd63f4ebf36a…

MALICIOUS

PDF

83.4 KB Created: 2021-03-29 07:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9172ba6cf7359b1930dcc79d4a4e3b0a SHA-1: 5a226cb4c4263b357ac04d7425c5e2e7d1b9cdb6 SHA-256: cd66fd63f4ebf36a5e175bb83bdde25d1eb06f4d4e13d1d1f823da54ccca39dd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, one of which, 'https://maypoin.ru/aws?utm_term=the+essential+feminist+reader+summary', is likely the primary lure. The document body, though heavily obfuscated, suggests a deceptive pretext related to a 'feminist reader summary'. The presence of embedded URLs and the link farm heuristic indicate an attempt to redirect users to malicious content.

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
  • 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://maypoin.ru/aws?utm_term=the+essential+feminist+reader+summary PDF link annotation
    • https://sufifova.weebly.com/uploads/1/3/4/7/134736026/wusepanotidonopimuma.pdfIn PDF document text
    • https://cdn.sqhk.co/demapibo/hgjeWdN/the_walking_dead_a_new_frontier_pc_free.pdfIn PDF document text
    • https://tezijetukiresu.weebly.com/uploads/1/3/5/3/135394197/parozive.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417045/normal_6025f0741a4ca.pdfIn PDF document text
    • http://sokinabunerir.iblogger.org/bawek.pdfIn PDF document text
    • https://firulozide.weebly.com/uploads/1/3/0/7/130775295/lorirodofujuxitu.pdfIn PDF document text
    • https://cdn.sqhk.co/surixirulol/Fzifujg/airplane_mode_song_limbo.pdfIn PDF document text
    • https://rubexanow.weebly.com/uploads/1/3/5/3/135346757/gevilin-geduzomuweg-vegurazevu.pdfIn PDF document text
    • http://mebesovinu.22web.org/rativifabexinala.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501029/normal_6020a2e23d407.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470841/normal_603766edb72b1.pdfIn PDF document text
    • http://pomuropujuj.22web.org/43317251926.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/82397861-78be-47c1-88b1-b1e0f0442193/gififerikuzikenujigogifil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9d2de46-388e-4df7-89cb-b69dda5301b2/what_are_green_bonds_and_how_do_they_work.pdfIn PDF document text
    • http://bawofifudip.rf.gd/90131707396.pdfIn PDF document text
    • http://vowatul.rf.gd/breeam_new_construction_2018_manual.pdfIn PDF document text
    • http://pitugozuput.epizy.com/64055099645.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bf32a5c-ec8a-4913-8657-7251bebdcc2a/roland_td_30_module_update.pdfIn PDF document text
    • http://timefata.epizy.com/fuwonibebajuselexij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f853221-2371-4c60-93dc-7a7c2a4b0461/is_it_hard_to_become_a_sniper_in_the_army.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b62bd204-3521-4c22-8a1b-64c2f4752e5b/56165662514.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_off00010601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10601 5196 bytes
SHA-256: 6868c8b315323cb70ef801e7e9da701d701e52e5664619e968fbdc9c44640d3b
font_01_sfnt_off00011789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11789 11880 bytes
SHA-256: dfd7554540e1a1b65ce49d574557c04ca9b101631bdba14fc3bfbf62184b3660

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