Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ae56e648ce420b4…

MALICIOUS

PDF

72.0 KB Created: 2021-02-20 21:57:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d148d123723d835ad8725f0b72b47d0f SHA-1: 7b5a8776b3b451d07292002a6f88f28c1d0ab4bd SHA-256: 5ae56e648ce420b42e199f4b90bfbd4f51085c3d83f896944426e4a1344869e2
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. One of the embedded URLs, 'https://baarspo.ru/strik?utm_term=taco+bell+menu+calories', is presented in a way that mimics search results, likely to trick users into clicking through to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://baarspo.ru/strik?utm_term=taco+bell+menu+calories
    • https://betetudiju.weebly.com/uploads/1/3/5/3/135348010/gafinudogudu_munowux_wolodag_sazuzatunata.pdf
    • https://xufalawat.weebly.com/uploads/1/3/0/8/130814535/03f2f4d4766.pdf
    • https://rixotojar.weebly.com/uploads/1/3/0/9/130969533/ce125b612334f1.pdf
    • https://lufisadoxusixa.weebly.com/uploads/1/3/4/5/134583632/zonuvalitanur.pdf
    • https://cdn-cms.f-static.net/uploads/4374968/normal_60151f3765c68.pdf
    • https://zizojatemizowen.weebly.com/uploads/1/3/4/0/134016780/tonexalefinar_baguwivomepuref_dapademuzak_donejeluvovax.pdf
    • https://pekafulif.weebly.com/uploads/1/3/1/4/131437409/9e9a629.pdf
    • https://jufozawuvinuxak.weebly.com/uploads/1/3/5/3/135326647/2742611.pdf
    • https://zodijezuworid.weebly.com/uploads/1/3/1/4/131483265/6732273.pdf
    • https://levunabul.weebly.com/uploads/1/3/1/4/131407164/fipabo-rewitoliwazidod-mafazofi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lofupiwosilabo.epizy.com/bravely_archive_reroll_guide.pdf
    • https://s3.amazonaws.com/woneketelak/what_size_battery_for_my_key_fob.pdf
    • https://s3.amazonaws.com/xurixado/fexetitirozedowubamap.pdf
    • http://gematufevisuw.rf.gd/xaxapedal.pdf
    • https://s3.amazonaws.com/fifomi/questions_for_an_interview.pdf
    • http://zipokuxabatu.rf.gd/annexure_k_from_epfo.pdf
    • http://riwexakax.epizy.com/94488775506.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d968.bin
8c184b388b5c88028e6676f468f5161bc551c2c8be9fcc662579f743f96f6b4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD968 5032 bytes
font_01_sfnt_off0000ea69.bin
8aad07bdc57c974adc7c3651e7cd350f2e5e16cc6ee8aca8fa5c42145be02075		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA69 12280 bytes

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