Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a39e76a7d607bf1…

MALICIOUS

PDF

69.8 KB Created: 2021-02-26 22:54:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: f9504b8eaf6f8fc90d4a7146aaf56ec5 SHA-1: aa51ee09305635547ac54966d95e8707cbd68c9a SHA-256: 8a39e76a7d607bf1ebc8c7173910e933f76f91332f9bab02f10da020c2045aac
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one prominent URL pointing to a domain associated with keyword-based redirection, suggesting a phishing or malware distribution lure. The document body, though heavily obfuscated, contains references to 'Cupertino union school district salary schedule' and 'wkhtmltopdf', indicating a potential pretext for the malicious content.

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://maypoin.ru/wix?keyword=cupertino+union+school+district+salary+schedule PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403676/normal_6001440305b6c.pdfIn PDF document text
    • http://avto-document.site/dimomurixaselubyqxz1.pdfIn PDF document text
    • http://leaninrzpd.site/gifixebijezunamoeim5x.pdfIn PDF document text
    • http://greenbike.shop/how_long_is_a_1_8_scale_rc_carn44gf.pdfIn PDF document text
    • https://cdn.sqhk.co/lepowabog/fYfjihj/capsule_wardrobe_checklist_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494436/normal_601d95a0afc27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369781/normal_5fd3a86029485.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486054/normal_60387eb70274c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370073/normal_602d2d9155c14.pdfIn PDF document text
    • https://cdn.sqhk.co/modajili/KyoejiD/viridiana_alvarez_alpinista.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lafumiseweno.epizy.com/56488460284.pdfIn PDF document text
    • http://fuvezijejek.epizy.com/85236245072.pdfIn PDF document text
    • http://dowijasimenazo.epizy.com/bhartiya_rail_apps.pdfIn PDF document text
    • http://dulubuli.rf.gd/bangla_tv_app_for_pc_free.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_off0000d483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD483 5168 bytes
SHA-256: 0da0050a16e112fa0883217df3e3d173a9dbeef884d9cb58ec9fd37c5bc4d02c
font_01_sfnt_off0000e612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE612 10604 bytes
SHA-256: b5bef3de5a87eae821b98ec483e9857fb2dd8aac5c6c6c0680d77056f92d6982

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