Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1fc1bf79b7cda38…

MALICIOUS

PDF

87.4 KB Created: 2021-03-01 21:49:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 05a202b798ff5daf1da28cf89b0adee5 SHA-1: 859b5eb3290f9bc51188d92ee7adc37494948a4e SHA-256: a1fc1bf79b7cda38205b689484ef4aca2db1597091cf57f9049de4dfe2d8e346
156 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 PDF files, which is indicative of a link farm for SEO manipulation. The primary URL, 'https://bologen.ru/wix?keyword=long+words+starting+with+red', suggests a lure to a site that may host malicious content or phishing pages. ClamAV and ML heuristics strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • 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://bologen.ru/wix?keyword=long+words+starting+with+red PDF link annotation
    • https://tujilebofali.weebly.com/uploads/1/3/5/3/135398949/4002368.pdfIn PDF document text
    • https://nedetuvozuwe.weebly.com/uploads/1/3/4/6/134699612/sakumajekoju.pdfIn PDF document text
    • https://pejedakava.weebly.com/uploads/1/3/1/4/131453393/vojik_dalawubupitede_belabupeseta_mikigifodiraged.pdfIn PDF document text
    • https://datedafobegab.weebly.com/uploads/1/3/5/9/135990096/bakilegizetijuxi.pdfIn PDF document text
    • http://sowaviwexurejo.22web.org/vexexalexasewagu.pdfIn PDF document text
    • https://jadusulad.weebly.com/uploads/1/3/4/7/134764450/vijojazi_dosadomakavimel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451376/normal_5ffb8867c4935.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500679/normal_5fd936ec694e8.pdfIn PDF document text
    • https://bexusisase.weebly.com/uploads/1/3/4/5/134596812/kiwasikibura_tegogufupux_kowaxo.pdfIn PDF document text
    • https://gijagexerifaru.weebly.com/uploads/1/3/5/3/135322880/turulusig-soxunenaz-zoxojabijofu-jafimuwe.pdfIn PDF document text
    • https://zimizediregewoj.weebly.com/uploads/1/3/4/0/134040679/8578276.pdfIn PDF document text
    • http://konobemozitu.iblogger.org/sheet_vinyl_flooring_installation_tools.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/vajefam/saxibuvutezogawerona.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/hourly_weather_report_austin_texas.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/71290028133.pdfIn PDF document text
    • http://zivakafipudejiw.epizy.com/gufejikagakadedijolak.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/uspstf_cervical_cancer_screening_guidelines_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/72156267779.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/bagel_factory_nutrition_information.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/80471131769.pdfIn PDF document text
    • http://fibotemirazopo.rf.gd/panuki.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_off00011c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C02 5088 bytes
SHA-256: 5c5a19f18e67c15e675a2892cafa68aabfda4067de05665904772685ee528ec3
font_01_sfnt_off00012d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5E 10236 bytes
SHA-256: eed077e8d6f91ab51bc832083b035e531fc8a8c673aa1294f77c47722f323b9e

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