Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa88855e75947760…

MALICIOUS

PDF

83.7 KB Created: 2021-02-12 12:25:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 978120a86ac436e13a2302b1313e3720 SHA-1: b0abe421759d65d45cba36d2aa100ff0bf55c021 SHA-256: fa88855e7594776022f965e75248816a2ab83af8f342fde739e25b82e896c54d
134 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/wix?keyword=onn+18+megapixel+digital+camera+instructions PDF link annotation
    • https://widosutolitidaf.weebly.com/uploads/1/3/4/8/134847614/c0f787.pdfIn PDF document text
    • https://tatedugede.weebly.com/uploads/1/3/4/3/134311852/3244067.pdfIn PDF document text
    • https://ladujeka.weebly.com/uploads/1/3/0/9/130969399/xaweponudimagimile.pdfIn PDF document text
    • http://loveworld.club/95451777531er7l1.pdfIn PDF document text
    • http://samyog.ru/colon_and_semicolon_worksheets367qa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389601/normal_5fe3f9fe79955.pdfIn PDF document text
    • https://buzomuzugagi.weebly.com/uploads/1/3/4/3/134313884/5c096c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gepuxaxevo.rf.gd/free_calling_application.pdfIn PDF document text
    • http://rakemexovujepez.epizy.com/50002510074.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/civ_6_guide_switch.pdfIn PDF document text
    • http://mirimanomuropa.rf.gd/xekubiwaveromixibuv.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/caravan_stories_trophy_guide.pdfIn PDF document text
    • http://devisufuxuvit.epizy.com/pottery_barn_christmas_crib_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/android_studio_tutorial_apk.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_off000109b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B1 5736 bytes
SHA-256: f4ec24b6ba3b70e690dfd527a3ffe4486b64eaa5ba7b401ea7515d1facfb1723
font_01_sfnt_off00011d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D22 10592 bytes
SHA-256: 48cd932e4bc1b1e191a051c20edbb5bda8ce744ed60ebab98ccce8df254601b1

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