Malicious PDF — malware analysis report

Static analysis result for SHA-256 224b5aa175eaf169…

MALICIOUS

PDF

68.3 KB Created: 2021-02-03 04:21:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1979988b37c77032bbcb84240c278e10 SHA-1: 08f4e6420b462c42b20d7768aa82d46301b3f17a SHA-256: 224b5aa175eaf1698eadfd7e1975ad34e45f71087fa6abc9763797371678c072
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a link farm on disposable hosting and a ML classifier. The embedded URLs point to various domains, suggesting a phishing or malware distribution campaign. The document body contains obfuscated text and metadata, indicating an attempt to disguise its malicious nature. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing lures.

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://maypoin.ru/123?utm_term=sloth+hiking+team+tank PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4500670/normal_5fc7588c67b10.pdfIn PDF document text
    • http://vnds-v.website/ohio_license_plate_lookup_owner_freetpjs5.pdfIn PDF document text
    • http://9gusevshop.website/pubg_mobile_hack_android_free_download202dr.pdfIn PDF document text
    • http://myluckybet.xyz/ligikavepoxuzezagolipapubd3qn9.pdfIn PDF document text
    • https://tugiwosigef.weebly.com/uploads/1/3/2/7/132740290/liduwaxad.pdfIn PDF document text
    • http://energierecrute-emplois.com/my_hillside_familyjewve.pdfIn PDF document text
    • http://republvinb.fun/dawewutabu1.pdfIn PDF document text
    • http://reduslim-buy.site/ates_ve_su_4_buz_devri_oyun_kolu4zivo.pdfIn PDF document text
    • http://lnstagram-help-businesss.com/diablo_2_players_commandz9np8.pdfIn PDF document text
    • http://itactical.xyz/2005781026dphir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498994/normal_6011234265c19.pdfIn PDF document text
    • http://krym.today/25343354138jb43a.pdfIn PDF document text
    • https://xupazipul.weebly.com/uploads/1/3/5/3/135325103/folawob_munipezos.pdfIn PDF document text
    • https://renokogepebamon.weebly.com/uploads/1/3/2/6/132696434/lafidelotodagad.pdfIn PDF document text
    • https://tojoxuponoseb.weebly.com/uploads/1/3/5/3/135395296/baxij.pdfIn PDF document text
    • http://tricitysikhs.com/elementos_de_la_tragedia_griega_en_antigonaa0lou.pdfIn PDF document text
    • http://hackins.site/hsk_level_4_past_paperstu6zk.pdfIn PDF document text
    • https://wubepifumemav.weebly.com/uploads/1/3/4/1/134109226/wejigoka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC139 4780 bytes
SHA-256: 32833642f8d89011cbb831796fe23937a50a440844d60f970c4c21b96415c653
font_01_sfnt_off0000d13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13F 11080 bytes
SHA-256: 47aeeb6083c642d1427c38a66cd56291e4a18b61baeb4a1ad1a995e05ae68649
font_02_sfnt_off0000f5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A9 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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