Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b983ef6a39eaf56…

MALICIOUS

PDF

75.4 KB Created: 2021-04-01 21:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: de476a80aa497c0feb77836bb2392f3a SHA-1: 5d330c190bb055d49d7f6b213f2ba3105be8fe3b SHA-256: 0b983ef6a39eaf568f47765459054ee93a0064287a375b01b453d7209b1029d6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/award?keyword=automatic+whiteboard+eraser+robot+pdf PDF link annotation
    • https://likufugusatu.weebly.com/uploads/1/3/1/4/131406708/1196897.pdfIn PDF document text
    • http://tegokujili.iblogger.org/map_of_the_united_states_with_capitals.pdfIn PDF document text
    • http://kuridelal.iblogger.org/rsmssb_ldc_answer_key_2018.pdfIn PDF document text
    • https://losarofimet.weebly.com/uploads/1/3/1/3/131384333/5bbd13c472f4e6.pdfIn PDF document text
    • https://subisadorug.weebly.com/uploads/1/3/1/6/131637552/fimebofegamukaxe.pdfIn PDF document text
    • http://varesazu.22web.org/why_my_dehumidifier_is_not_collecting_water.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465908/normal_6055bcde5a556.pdfIn PDF document text
    • http://zomixuxoluzijum.mywebcommunity.org/articad_tutorial.pdfIn PDF document text
    • http://zaketukurokisof.iblogger.org/computer_monitor_repair_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484169/normal_601bdd79d5b36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418583/normal_6025e5f861c8a.pdfIn PDF document text
    • https://kimetupuvojum.weebly.com/uploads/1/3/2/6/132680977/d2f08ce81dc.pdfIn PDF document text
    • http://pelaberofusej.iblogger.org/purobemupekamuza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dowuvoduwitovos.atwebpages.com/53575529346.pdfIn PDF document text
    • http://sasoregasot.epizy.com/6743000272.pdfIn PDF document text
    • http://tebubejusudigu.rf.gd/musegexesosewimirelakop.pdfIn PDF document text
    • http://xexazopaxabet.epizy.com/aldi_sd_angebote_prospekt.pdfIn PDF document text
    • http://levewome.epizy.com/81879926582.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_off0000e889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE889 5584 bytes
SHA-256: 47a62cd16455effbd7ef0c46fa56540764118c4a0f2f98cf43cb1efee4f4309c
font_01_sfnt_off0000fb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB61 10808 bytes
SHA-256: f472530ee1753c85cb80e6e2ebb04d1f2090b151d818765b8ee59b7839c7f2e4