Malicious PDF — malware analysis report

Static analysis result for SHA-256 72f54b7249df3828…

MALICIOUS

PDF

32.9 KB Created: 2020-04-16 21:39:35 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 5f2c0e1985e04905acef8187e0b8077b SHA-1: 803940d9807ae64826f64bb863aa882125bee6aa SHA-256: 72f54b7249df3828a2c38734107f0a473a01ebcfed16de3e05f36ea6c00438b7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, many of which appear to be part of a link farm designed for SEO manipulation or to host further malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the sheer volume of external links suggests a watering hole or phishing-related attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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.
  • 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://balanceangel.com/uploads/1/3/0/5/130550693/130550693.html#krueger+sheet+metal+address
    • http://blocktekholdings.com/uploads/1/3/0/5/130540049/lekegeluxi_senivu_noforulilozob_defele.pdf
    • http://tedsonthebeach.com/uploads/1/3/1/6/131606876/d5a75.pdf
    • http://modernhomebuyers.us/uploads/1/3/0/7/130739919/zovib-tasozaj-tavefeb.pdf
    • http://mtchoirs.com/uploads/1/3/0/5/130541221/nidobonojujeji.pdf
    • http://renewyoucancertologyuk.com/uploads/1/3/0/5/130544872/392595.pdf
    • http://911flex.net/uploads/1/3/0/7/130776405/dd9781daa711cd.pdf
    • http://konekly.com/uploads/1/3/0/2/130271212/485437.pdf
    • http://dbinspectionsla.com/uploads/1/3/1/1/131164507/8179210.pdf
    • http://athensrestaurantpartners.com/uploads/1/3/1/1/131164293/5057525.pdf
    • http://emilylandrylmt.com/uploads/1/3/1/4/131453259/gebadumi.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a7b.bin
248e6ed5d4a95f24a403d0fd71a119875d9175dc70478b3e40680a30e9516bec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A7B 7460 bytes

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