Malicious PDF — malware analysis report

Static analysis result for SHA-256 55dd3978a52df910…

MALICIOUS

PDF

74.9 KB Created: 2021-04-09 12:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 14e0c40278c5f72f262dbf86a99c40ff SHA-1: df3ba2e1e47288779139f4b67552027f2868ac5f SHA-256: 55dd3978a52df91053429ae68aa635e5178cba13094ce34eb11914d4ba512cd6
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one, `https://xajibur.ru/strik?utm_term=samsung+c460fw+printer+imaging+unit`, appearing to be a phishing or malware distribution lure. The PDF's structure and the presence of many links suggest it functions as a link farm to redirect users to potentially harmful sites.

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://xajibur.ru/strik?utm_term=samsung+c460fw+printer+imaging+unit PDF link annotation
    • http://sizegoduxuxa.mygamesonline.org/puguzarofupakadekelej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369633/normal_60292fa582752.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419225/normal_606aec41cc53e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480382/normal_5fd0317019f0b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374517/normal_6007eba8daecc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411702/normal_601b454e0194a.pdfIn PDF document text
    • http://tefukuk.iblogger.org/bmw_330ci_auto_or_manual.pdfIn PDF document text
    • http://kafujaguvo.mygamesonline.org/49368486791.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491669/normal_6063dac268e07.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bipulusesag.epizy.com/the_power_of_now_author_eckhart_crossword.pdfIn PDF document text
    • https://s3.amazonaws.com/zulezov/adobe_reader_6._0_version_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/784eedb5-b89d-4d5c-82ed-40df7f391b14/44340179313.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64d9f1e2-024e-40b2-9f9e-243e8346dc18/dubadoxupus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb0133df-8783-409b-b82a-5bace652ed08/how_to_comfort_someone_who_is_stressed_about_exams.pdfIn PDF document text
    • http://fiforeru.atwebpages.com/how_to_use_a_steamer_bamboo.pdfIn PDF document text
    • http://nipuxedexup.epizy.com/jegifopovifaxe.pdfIn PDF document text
    • http://pobopujobezov.rf.gd/canon_mf4450_toner_number.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/jagumesikijisegegovixesig.pdfIn PDF document text
    • http://boxitevu.rf.gd/67899867557.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65e99ac3-6237-4b31-bc08-0a984fdd2903/8397599696.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_off0000e59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59D 5884 bytes
SHA-256: 8445fb6b09f5dc28dd1e1ec796b45f8435813e2db74dc5fd3ef926b574739756
font_01_sfnt_off0000f9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AA 10704 bytes
SHA-256: c9f7528fc1a81ba4c14ac4b3bf493101952f2260573b65f277cd55ca7334bd83

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