Malicious PDF — malware analysis report

Static analysis result for SHA-256 d66a7b08fa4c5add…

MALICIOUS

PDF

77.6 KB Created: 2021-02-24 19:14:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 09ca9f1b1972c07cdf61f5ee61b85c41 SHA-1: 478dab5d04b09b48d8a19b44cd234502e93cce1d SHA-256: d66a7b08fa4c5adda34a7d8d23082709434c87955e152eecca94eadec698e85b
126 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous links to external websites, many of which are hosted on disposable domains or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though partially corrupted, suggests a lure related to 'interview questions for teachers about parent involvement' to entice users to click the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/123?utm_term=interview+questions+for+teachers+about+parent+involvement PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470545/normal_5ffb49be5c46c.pdfIn PDF document text
    • https://cdn.sqhk.co/semoxumid/ahhqgic/13635794736.pdfIn PDF document text
    • https://cdn.sqhk.co/zolilobup/ipheXjd/kaiser_permanente_phone_number_woodland_hills.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366341/normal_600253c0a9b74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369487/normal_600dec0f893a3.pdfIn PDF document text
    • http://fullpisetc.ru/dawefuklemd.pdfIn PDF document text
    • https://jokuvaput.weebly.com/uploads/1/3/4/5/134589987/f22015c02d02.pdfIn PDF document text
    • http://sell-toclick.online/62046389910css3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421782/normal_600ff4eaec31a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485942/normal_5fd7206390b65.pdfIn PDF document text
    • http://topdouche.xyz/swann_dvr8-4575_manual_downloadph9ab.pdfIn PDF document text
    • http://ch-bewertung-2888.xyz/king_crown_template8k69w.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_off0000e3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C7 5492 bytes
SHA-256: ab8a83c23ec5cff8b6b8634dec0e4c899b2f20ba40e16a777f4728724395b069
font_01_sfnt_off0000f660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF660 10672 bytes
SHA-256: edc2c2a7528321a69da8096e783df430100fafd32c6815b858c098fced8fcf36
font_02_sfnt_off00011aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAC 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

Open this report in the interactive analyzer, or submit your own file for analysis.