Malicious PDF — malware analysis report

Static analysis result for SHA-256 646a25322c2a2275…

MALICIOUS

PDF

77.6 KB Created: 2021-02-21 20:48:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a755de8de4513675742dcd62e1704a0f SHA-1: 9aa1e506fea6edcbcef940bc624d7ec3478e7d7d SHA-256: 646a25322c2a22754d36cd7cee064ffe589a7f113cafa00f184b3119a067027f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV specifically flagging it as a phishing trojan. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://baarspo.ru/strik?utm_term=ghislaine+maxwell+net+worth+2018 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412570/normal_601833063c9ea.pdfIn PDF document text
    • https://cdn.sqhk.co/zexupibo/datNiaI/child_care_licensing_colorado_rules_and_regulations.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480145/normal_602ffb15f40f6.pdfIn PDF document text
    • https://cdn.sqhk.co/natokaze/c8pggi9/68434492573.pdfIn PDF document text
    • https://cdn.sqhk.co/bivuwusim/hp2jLj5/nebuxunonininejijusone.pdfIn PDF document text
    • https://mezovojexojija.weebly.com/uploads/1/3/0/8/130874002/9146985.pdfIn PDF document text
    • https://cdn.sqhk.co/lokutibu/6OIHhjc/applocker_gpo_template.pdfIn PDF document text
    • https://kinigapiluxuke.weebly.com/uploads/1/3/4/8/134863840/7304729.pdfIn PDF document text
    • https://bodovusinorone.weebly.com/uploads/1/3/5/3/135347185/vakox.pdfIn PDF document text
    • https://cdn.sqhk.co/ponigubik/fCgggfH/63077502727.pdfIn PDF document text
    • http://fudopajir.iblogger.org/75425568264.pdfIn PDF document text
    • https://cdn.sqhk.co/jaruxabal/if7Wo9G/71705088372.pdfIn PDF document text
    • https://tofajoxoroj.weebly.com/uploads/1/3/1/6/131636991/xixabufuwe.pdfIn PDF document text
    • http://runatem.66ghz.com/18010663166.pdfIn PDF document text
    • https://cdn.sqhk.co/levowexesu/9gdhzgl/vino_pecorino_vellodoro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tiwemevi.rf.gd/science_city_kolkata_guide_map.pdfIn PDF document text
    • http://lolofekigosot.epizy.com/dovunifulono.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_off0000f0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F5 5636 bytes
SHA-256: 504c99ed4f223ec68c8bfef5c547284187f8d55f816ae8a532cdbd3fce5a2c50
font_01_sfnt_off0001040a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040A 10764 bytes
SHA-256: cc7a37fd83d2271e7c47092d3cf89bd584a04ca409fa4a94dc52b97cb396bb2d

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