Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf772b8f1786d85f…

MALICIOUS

PDF

66.7 KB Created: 2021-03-22 23:26:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9f6919eb82a19d594c6f98139c033203 SHA-1: ceb3a51721577b185e0b96969524252cae6a063d SHA-256: bf772b8f1786d85f5204bd9ab8c0eab2bc8053d8015d7f344170df670f8778fa
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are flagged as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. The document body, though heavily obfuscated, appears to be a lure related to a 'Denton texas weather report', aiming to trick users into visiting the malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://golowaki.ru/123?utm_term=denton+texas+weather+report PDF link annotation
    • http://limecash.xyz/baby_girl_clothes_3-6_months_uk1lbbl.pdfIn PDF document text
    • http://lienforkid.com/947954329432lb9c.pdfIn PDF document text
    • https://lugumeduzox.weebly.com/uploads/1/3/0/7/130740149/c99b89f0cdaa.pdfIn PDF document text
    • https://marezupudi.weebly.com/uploads/1/3/0/8/130874377/fezel-zulebafoxajug.pdfIn PDF document text
    • http://idealica-official-it.website/6607456686y8a2y.pdfIn PDF document text
    • http://copyrightproblem.com/netis_e1_instrukcjali96o.pdfIn PDF document text
    • http://freshmind.net/safe_zone_lyrics_seebu64ey.pdfIn PDF document text
    • http://tradebot.space/piwopurapewas3hrdq.pdfIn PDF document text
    • http://gadatoreneperil.mygamesonline.org/40342716996.pdfIn PDF document text
    • http://lutefadeba.scienceontheweb.net/tablatura_bohemian_rhapsody_guitarra.pdfIn PDF document text
    • http://mx50off.info/ruxivazenuludowegikexotux6716v.pdfIn PDF document text
    • http://vertitribe.store/kinetic_and_potential_energy_worksheet_answer_keyeko5n.pdfIn PDF document text
    • http://jekeluxuto.mywebcommunity.org/number_theory_course_syllabus.pdfIn PDF document text
    • https://likemojinefafus.weebly.com/uploads/1/3/1/4/131406739/a1eb998d93d6.pdfIn PDF document text
    • http://podjem2.club/bibliographic_information_apa_example1286v.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/949524c1-5096-4de2-81d0-f03fd563abc1/numefivuxigawogo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7112c7e1-e497-4f46-8171-169d4a9556ad/what_can_the_alexa_cube_do.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f6961f0-d563-4edb-9c63-4446ddcbab60/can_flavored_condoms_cause_uti.pdfIn PDF document text
    • https://ec8c99fd-5413-4e38-b6a0-2ccbba71fc6f.filesusr.com/ugd/de02f3_7d4d2de10e5a4d75b96ee41f02f653a0.pdf?index=trueIn PDF document text
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_c4dcabd3f3424c279255bab15ebd9690.pdf?index=trueIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA06 5032 bytes
SHA-256: 7bbf5a10ac7581a4ca35578aaec8bbad9095720d146461f0f75f8efa9e6d1563
font_01_sfnt_off0000db3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3A 10160 bytes
SHA-256: ecb8f9bfe64c8f8db53b25be2b225b0fc337e3aac620645274843c55799791a2

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