Malicious PDF — malware analysis report

Static analysis result for SHA-256 e93746341ca1100c…

MALICIOUS

PDF

87.5 KB Created: 2021-04-05 21:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 1ab68d2a5e35c544b9058da2990fcb86 SHA-1: 9b33a3e978a21520cd6579023de1f61d48405811 SHA-256: e93746341ca1100c4b0d5931bd430500195ff592a9acedbea3990e08f421f39d
126 Risk Score

Malware Insights

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

The PDF file contains numerous URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. One prominent URL, 'https://nipisod.ru/strik?utm_term=brother+printer+hl3170cdw+manual', suggests a lure related to printer manuals. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=brother+printer+hl3170cdw+manual PDF link annotation
    • http://tonedomopoja.scienceontheweb.net/19472031064.pdfIn PDF document text
    • http://tozaworewinox.mywebcommunity.org/electronic_band_structure.pdfIn PDF document text
    • http://woziwowariv.sportsontheweb.net/71232778346.pdfIn PDF document text
    • http://javifimawa.mygamesonline.org/52644969955.pdfIn PDF document text
    • https://cdn.sqhk.co/powurejur/fqjcXPQ/marutetudiwodurazexal.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/jbrgjic/amazed_autopilot_worship_lyrics.pdfIn PDF document text
    • http://jetavof.sportsontheweb.net/weight_training_for_swimmers.pdfIn PDF document text
    • http://mizizufiku.mywebcommunity.org/metro_2033_last_light_redux_trainer.pdfIn PDF document text
    • https://cdn.sqhk.co/gegatuzikat/aiaIheD/34839055839.pdfIn PDF document text
    • http://xikisavi.scienceontheweb.net/mujenalevunudalazoge.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://piwolimosopobu.myartsonline.com/arabic_characters_are_disjointed_and_reversed.pdfIn PDF document text
    • https://0cfe495c-9a5f-46a1-a5f3-fb21b6211bac.filesusr.com/ugd/7aabb2_dbb535dcb8914f9098f3ab6b87c5d789.pdf?index=trueIn PDF document text
    • http://danofawo.rf.gd/15162205793.pdfIn PDF document text
    • http://wusozupit.myartsonline.com/baixar_adobe_reader_x_gratis.pdfIn PDF document text
    • http://jalameki.epizy.com/the_oxford_handbook_of_functional_data_analysis.pdfIn PDF document text
    • http://dekixugo.epizy.com/49147460683.pdfIn PDF document text
    • http://gudukiderunusu.myartsonline.com/79371999818.pdfIn PDF document text
    • http://wozimape.onlinewebshop.net/tirinaboropov.pdfIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_cb8b5c3105f045768842eb94473a49ff.pdf?index=trueIn PDF document text
    • http://xuvotawelotito.epizy.com/sawajitogexeko.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C4 5712 bytes
SHA-256: 0cbeb5f53e812e34f05194ee2bd6d3ca0154c4726fd42b24e10b8945aaf7436c
font_01_sfnt_off0001182f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182F 10252 bytes
SHA-256: b23507cf63e1966a927df1a2022a05b1220a054ff35bedb799296f34061136e9
font_02_sfnt_off00013b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B7F 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953

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