Malicious PDF — malware analysis report

Static analysis result for SHA-256 44ffb3869027cd3d…

MALICIOUS

PDF

70.2 KB Created: 2021-01-06 21:49:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: ac57efcbc09a5c2329a5af3cdea33eea SHA-1: ec3a71447dc125acf0ff9e18b9c1b39fbb9662da SHA-256: 44ffb3869027cd3d3acc17cf66f433ab2e5bd0dba13a326b3934ce33405e6da6
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf and includes a string that appears to be a lure for a crossword puzzle answer. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with ClamAV detection as Pdf.Phishing.Trojan, strongly indicates a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://traffset.ru/aws?utm_term=crossword+answer+for+hitherto+unsurpassed PDF link annotation
    • https://tafogufuju.weebly.com/uploads/1/3/4/6/134638326/6524887.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/ig2ihji/fonivotewonu.pdfIn PDF document text
    • https://cdn.sqhk.co/noxuwitide/ugehc8C/liwigofuzidojewanilikef.pdfIn PDF document text
    • https://tokafiwunan.weebly.com/uploads/1/3/4/3/134372509/9190058.pdfIn PDF document text
    • https://bazapefonufoteb.weebly.com/uploads/1/3/4/6/134637130/ea433217c68eec.pdfIn PDF document text
    • https://cdn.sqhk.co/leperanurosi/xidUivk/59618501428.pdfIn PDF document text
    • https://woliwejimagevin.weebly.com/uploads/1/3/4/3/134319070/buxebejitozi_zobonetugagaju_zunirupabod_pofokadixiwa.pdfIn PDF document text
    • https://ligiponofejejo.weebly.com/uploads/1/3/4/3/134346234/8008573.pdfIn PDF document text
    • https://xepawonim.weebly.com/uploads/1/3/0/7/130776577/vesipuxunuwovunuwi.pdfIn PDF document text
    • https://tigidejuremu.weebly.com/uploads/1/3/4/5/134502839/wewix_pefedeleluji_sejogesu_nevosanulajuj.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwufupi/jdiiKhe/bitmoji_virtual_classroom_extension.pdfIn PDF document text
    • https://cdn.sqhk.co/vagewovupug/jjdiahj/tentacle_wars_level_10.pdfIn PDF document text
    • https://cdn.sqhk.co/nutanujel/2gdifN3/61328040586.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/822c5a65-eed0-4363-bb04-f88634cbc63b/dyson_ball_multi_floor_canister_vacuum_-_bagless_-_hepa.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_off0000d5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BF 5092 bytes
SHA-256: d198411f5fa14bb8aa7cff82a8aff86a0734070ec1564e0e0b8466b966231ae1
font_01_sfnt_off0000e71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71C 10788 bytes
SHA-256: 2493b3dbaba4d269e48e2990f9f7cae2cdb5b72bb7038baace4f54d46fea9d27

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