Malicious PDF — malware analysis report

Static analysis result for SHA-256 286b6b8788b72deb…

MALICIOUS

PDF

68.3 KB Created: 2021-03-04 09:25:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e43770ed57b68a90c4f9830e63ce8610 SHA-1: ada277cd506addd6d7cde3af6d333d55df735e68 SHA-256: 286b6b8788b72debe46af63ece3005043140b1eea3de31fd62706b9a9843dcf5
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically referencing 'how to get fl studio cheaper', indicating a lure for users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://xajibur.ru/award?keyword=how+to+get+fl+studio+cheaper PDF link annotation
    • http://salearea.pro/chemistry_the_molecular_nature_of_matter_7th_edition_jespersenddrob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409992/normal_60163664962f4.pdfIn PDF document text
    • http://samelike.site/9264784537lb9e.pdfIn PDF document text
    • http://goossyy.online/hotpoint_refrigerator_not_cooling_but_freezer_is_fine110nu.pdfIn PDF document text
    • https://cdn.sqhk.co/budotedo/helidC5/tilifilixutitoxopulupeva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488315/normal_5fe73e4d439b5.pdfIn PDF document text
    • https://lutaxebibutemun.weebly.com/uploads/1/3/1/3/131380730/5667b01d51.pdfIn PDF document text
    • https://cdn.sqhk.co/musutalivun/jaEtLhh/destiny_2_outbreak_perfected_catalyst_review.pdfIn PDF document text
    • http://shoop-fp.ru/xefunimaramaxrvdlp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495855/normal_6024bd43a78c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409630/normal_5fd82626cf68a.pdfIn PDF document text
    • http://simultaneously.space/misegisarudezijerizoiigaw.pdfIn PDF document text
    • http://santaparker.store/971228865282z45i.pdfIn PDF document text
    • https://fosisejabevenot.weebly.com/uploads/1/3/5/3/135398983/5762727.pdfIn PDF document text
    • https://cdn.sqhk.co/kululojilo/gh2hbig/jikojiwu.pdfIn PDF document text
    • http://matroskin.space/83001810345d1ej8.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/suzujewa/47006433862.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_off0000cc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC94 5468 bytes
SHA-256: 46479cf7d2e129c80eef9d64ab5c35e955a93359653306957d62f2075de18dc9
font_01_sfnt_off0000df48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF48 10684 bytes
SHA-256: 0ad86b8b71dd5ae185b6fee1c8773e906fc20792c0039f727a9b66e08142106a

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