Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0b05ea2b39d5f7…

MALICIOUS

PDF

78.6 KB Created: 2021-01-25 04:46:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f5f011cf1a343245276bb1a44563ad0d SHA-1: 1fb72b664ac7a9c0acbc12ed3f5748b0e247820e SHA-256: aa0b05ea2b39d5f7429f5046b03f71f9f6820767a903715753ab4ee2c84c56e5
134 Risk Score

Malware Insights

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

The file is a PDF containing multiple embedded URLs, some of which point to disposable domains and are flagged as link farms. The presence of a 'download button' heuristic and a high ML score strongly suggest a malicious intent, likely phishing or malware delivery. ClamAV detection further confirms its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffnew.ru/123?utm_term=unblocked+games+pokemon+sapphire PDF link annotation
    • https://cdn.sqhk.co/fazejitev/jijbuji/pinball_map_wisconsin.pdfIn PDF document text
    • http://wazojox.iblogger.org/27917896826.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vevemaj.rf.gd/lujikuzajixuvagudot.pdfIn PDF document text
    • http://rewifavad.epizy.com/channelling_my_spirit_guide.pdfIn PDF document text
    • http://datidogebe.epizy.com/pejevuvuzizasawopikubovak.pdfIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/1718831578.pdfIn PDF document text
    • http://segisubab.epizy.com/398064766.pdfIn PDF document text
    • http://nusilelopalal.epizy.com/38551792714.pdfIn PDF document text
    • https://s3.amazonaws.com/wovisak/87977611805.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/57302801166.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/chopin_concerto_1_piano_solo_sheet.pdfIn PDF document text
    • http://zebofazedixa.rf.gd/pukas.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/hardwood_floor_steam_cleaners_consumer_reports.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_off0000f2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C0 5684 bytes
SHA-256: d15fb57c86229d51e6bd7c7a44985818768119069b44f18355342e151580e10c
font_01_sfnt_off000105e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E2 11312 bytes
SHA-256: 90984cc0ec55a487caa0f3e9689db1cbe47a2d7ae77c5637291497a55863a054

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