Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef56229d0dd291e0…

MALICIOUS

PDF

66.3 KB Created: 2021-02-17 13:24:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e8b742333b7394c80ca14f56e00d8e70 SHA-1: 0f64ae08c415db8d6c7c59486a953014ae7ff112 SHA-256: ef56229d0dd291e0cb02589f8b63c24bcde592ac4e5f9fc6d56b9040bc079513
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or spam distribution mechanism. The presence of external URIs and embedded URLs points towards an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wix?keyword=confucianism+religious+book PDF link annotation
    • http://espaceclient-cmb.com/sivexapinabqf7k.pdfIn PDF document text
    • https://xovadodelemowuz.weebly.com/uploads/1/3/1/3/131383330/tixudegipur.pdfIn PDF document text
    • https://sinekagu.weebly.com/uploads/1/3/4/8/134855021/girobe.pdfIn PDF document text
    • https://nakagikirowi.weebly.com/uploads/1/3/2/6/132695306/9884716.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390095/normal_5fde7f6af2d07.pdfIn PDF document text
    • http://my-favshopg.online/76290182570gsmdy.pdfIn PDF document text
    • http://trysucre.pro/how_to_get_the_god_mask_in_revelationsw3bcn.pdfIn PDF document text
    • https://cdn.sqhk.co/gegenosuzun/hcieegc/jibemubosuma.pdfIn PDF document text
    • https://lovebaxubifutu.weebly.com/uploads/1/3/4/3/134322000/7dad9474860c6.pdfIn PDF document text
    • http://servempieza.site/rebugizixegenuvizitewekeav10h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://baxajuzurajuj.rf.gd/georgia_boat_bill_of_sale_template.pdfIn PDF document text
    • http://jefebewo.epizy.com/90_day_onboarding_plan_template.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_off0000c8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F0 5308 bytes
SHA-256: 7c130ee0d41a05ac9c6bd230b5551d54bdcd6703797254c0ff7684543e4bb5df
font_01_sfnt_off0000daf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF0 9948 bytes
SHA-256: 04a070d9e8599ec36c0b30b1e40b4a3987b5408b170163329bb7326fccd8420c

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