Malicious PDF — malware analysis report

Static analysis result for SHA-256 862a6b3d66dd7098…

MALICIOUS

PDF

32.8 KB Created: 2020-06-01 07:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: beada9df43eb80e07d2e879aaf0d87e0 SHA-1: 653a17585578de0897b144dbb55296f92fe7465f SHA-256: 862a6b3d66dd7098d7b5a857c6293802eeb8bf50a0994c5454e4d3ab943d9b4f
116 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links to external PDF files, a common tactic for SEO poisoning or distributing malicious content. The heuristic 'SE_CALLBACK_LURE' indicates the document's content is designed to trick users into calling a phone number, likely for a scam. While no scripts were directly extracted, the presence of embedded URLs and the ML classification strongly suggest malicious intent, likely related to phishing or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://desbrocesylimpieza.com/uploads/1/3/1/3/131383332/131383332.html#ram+ile+de+france+adresse
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://forivugovov.files.wordpress.com/2020/05/pimizedekarizo.pdf
    • https://mumovafixax.files.wordpress.com/2020/05/6440638611.pdf
    • https://fagirixol.files.wordpress.com/2020/05/54061711154.pdf
    • https://dudixefusef.files.wordpress.com/2020/05/18664691645.pdf
    • https://zibebuti.files.wordpress.com/2020/05/maxiledo.pdf
    • https://nolelopix.files.wordpress.com/2020/05/79190910199.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000527f.bin
53bf867e03810b83866c33b9d088ead322f9ba1c8c37631db8f3c7f59597d722		 pdf-font-stream PDF embedded font (sfnt) at offset 0x527F 11452 bytes

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