Malicious PDF — malware analysis report

Static analysis result for SHA-256 aae40d38bfc32738…

MALICIOUS

PDF

67.6 KB Created: 2021-01-13 15:38:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3a38bfe83b69c69c9c49752b0da8d30a SHA-1: a6b1d11b85dd45968916e13cff6eee3166cc1889 SHA-256: aae40d38bfc32738e3553de86118da1fd47398c51990db287d3554b3ba2ee1e7
184 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers also flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely related to initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7936

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 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
  • 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=harvard+bluebook%2528+19th+edition+citation+format PDF link annotation
    • https://bosagibanili.weebly.com/uploads/1/3/2/6/132682134/a7ca1a5bc1d.pdfIn PDF document text
    • https://cdn.sqhk.co/xufaribo/Hvkxjh1/momifurerupaxeruviwa.pdfIn PDF document text
    • https://zorelivuveromip.weebly.com/uploads/1/3/4/4/134438733/5a6a66a81cc.pdfIn PDF document text
    • https://tusutaxuwipafu.weebly.com/uploads/1/3/4/4/134403355/zedapebiximipopopuwe.pdfIn PDF document text
    • https://daniwevuwawudo.weebly.com/uploads/1/3/4/8/134849628/wimimulowopamu-kavipa.pdfIn PDF document text
    • https://cdn.sqhk.co/rexixugepir/kjbygfc/callaloo_plant_jamaica.pdfIn PDF document text
    • https://cdn.sqhk.co/kavejufa/hIihhaM/vuvimomudupuropax.pdfIn PDF document text
    • https://sefusozikoju.weebly.com/uploads/1/3/4/3/134366316/pesomug-lumirikuf-nijixadufufa.pdfIn PDF document text
    • https://cdn.sqhk.co/feripamapuv/geiflHn/mobile_patrol_missouri.pdfIn PDF document text
    • https://wowiwega.weebly.com/uploads/1/3/1/4/131453904/dokitegiwati.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/subud/vertebrate_zoology_practical.pdfIn PDF document text
    • https://s3.amazonaws.com/megulu/pap_guidelines_algorithm.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/vsco_full_filter_android.pdfIn 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_off0000d7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E8 5596 bytes
SHA-256: 5125345f01bc02bbd42bb339846095825f072aa6f87fd6326ab03e44cb9a1ca0
font_01_sfnt_off0000eadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADB 12172 bytes
SHA-256: fcd21484906ea33b1dd2406ffe76e02c367cdbe82e77063191e4e29f06f2bfb1

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