Malicious PDF — malware analysis report

Static analysis result for SHA-256 d521033e94c87a40…

MALICIOUS

PDF

81.1 KB Created: 2021-02-20 11:40:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 011c9752d48f029133682515d838ae6a SHA-1: ba11b81a707238629be2f1dbc6e6233a5414e131 SHA-256: d521033e94c87a40ff25b3b7f59ef243b514f16c602dd744a554ba7b11ec2ae5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('crophysi.ru') that is likely used for phishing or malware distribution. The presence of a link farm heuristic further supports the malicious nature of the document, suggesting it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crophysi.ru/strik?utm_term=2005+jeep+grand+cherokee+limited+power+steering+pump PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4462992/normal_5fe72fc71a89b.pdfIn PDF document text
    • http://malafasa.iblogger.org/kimufuxatetewewajotu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388063/normal_6030529f6d51a.pdfIn PDF document text
    • http://wumokejo.iblogger.org/target_fitted_sheets_only.pdfIn PDF document text
    • http://kekebum.22web.org/26380167483.pdfIn PDF document text
    • https://cdn.sqhk.co/luwagoma/dhahihh/jajagetowodubadunumawu.pdfIn PDF document text
    • http://sewaseg.22web.org/declining_a_flexible_working_request_template.pdfIn PDF document text
    • https://cdn.sqhk.co/rubupidorinu/9hdv6p6/lulubadefopupawigapop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488592/normal_60224c615dbce.pdfIn PDF document text
    • https://cdn.sqhk.co/sebutarukaw/cid4RBH/24659529650.pdfIn PDF document text
    • http://zijimesaxa.iblogger.org/17271888948.pdfIn PDF document text
    • http://masovizifuzaro.iblogger.org/coreldraw_2019_full.pdfIn PDF document text
    • https://cdn.sqhk.co/xubipoxeguza/iWjehje/radio_online_cbn_brasilia.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zezenagiwetubav.rf.gd/cbt_nuggets_mcsa_2016.pdfIn PDF document text
    • http://telijurubora.rf.gd/56925970529.pdfIn PDF document text
    • http://mojezira.rf.gd/state_space_representation_in_canonical_form.pdfIn PDF document text
    • http://jilutuve.rf.gd/aeroflex_ifr_6000_service_manual.pdfIn PDF document text
    • http://vometavofol.epizy.com/zakojuzumili.pdfIn PDF document text
    • http://karifopiti.epizy.com/57364231459.pdfIn PDF document text
    • http://xilawon.epizy.com/how_spirit_guides_communicate.pdfIn PDF document text
    • http://pejebitopaw.rf.gd/glamorous_clothing_size_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF156 5904 bytes
SHA-256: daec4b54a98b8dcaa4faa2a8664f07078aabbe7a06235c737648e48c4e8659c2
font_01_sfnt_off0001054b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054B 10436 bytes
SHA-256: ea332e6c962b37b7231c335d98f882b000bce4fbc690f95576034b42cc4eb427
font_02_sfnt_off000128da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128DA 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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