Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d8542602fce0c85…

MALICIOUS

PDF

40.0 KB Created: 2020-04-14 12:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 23659613141de211065533745dc9c7bd SHA-1: dfa893752edb3491318b6d1752b0ba77b197d35d SHA-256: 7d8542602fce0c854913c3f8e75d97e0b9b91a757d280aae6b15558b1d2723ce
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the structure suggests the PDF is designed to redirect users to a multitude of other PDF documents, potentially for SEO spam or to host malicious payloads. The primary attack pattern is likely Spearphishing Attachment, with the embedded links serving as the mechanism for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://christinafriedle.org/uploads/1/3/0/6/130621130/130621130.html#apporto+calorico+alimenti+pdf
    • http://digitalartssociety.com/uploads/1/3/1/4/131406629/gesezo_kilixiza.pdf
    • http://dreamcarzcollectiblediecastmodels.com/uploads/1/3/0/5/130551880/48c8b39b83b18c.pdf
    • http://conectamarketing.org/uploads/1/3/0/5/130539432/f0a0a.pdf
    • http://denniskaping.com/uploads/1/3/1/1/131163859/9240209.pdf
    • http://jarvisebenezer.ca/uploads/1/3/0/8/130873795/7420112.pdf
    • http://icecreamfundaes.com/uploads/1/3/0/6/130604768/6836869.pdf
    • http://lsbookkeeping.net/uploads/1/3/0/7/130776754/xejizoz-rilifelilo.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_off0000711a.bin
2f59659f7e8e0f980ea00e65bf3e787eabf7c319fa2a91ba9b305eb2ae1b5bc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x711A 9980 bytes

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