Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e8255b1b6c25ff1…

MALICIOUS

PDF

34.0 KB Created: 2020-06-02 05:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d71af0bf6044a2b68a7940c14c64df9b SHA-1: 4f95f06863c3ad7de0a31d7bf5ed446f1336b734 SHA-256: 9e8255b1b6c25ff1264b229f10837e7dc5f393c8f8e3fb35452c44b2f93a4478
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The embedded URLs likely serve to redirect users to malicious content or facilitate SEO manipulation, a common tactic for distributing malware or phishing pages. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://mightypharaoh.com/uploads/1/3/1/1/131164393/131164393.html#pogil+role+cards
    • http://westernprovince.net/uploads/1/3/0/2/130270837/firosamakuw-xemujefiwiwonun-gavolerewaseb.pdf
    • http://stellarcocktails.net/uploads/1/3/0/4/130436014/420ea4b.pdf
    • http://englishtherapy.pl/uploads/1/3/0/3/130313075/9709410.pdf
    • http://108bonniebrook.com/uploads/1/3/0/2/130270982/529378.pdf
    • http://chrisburnettvoiceactor.net/uploads/1/3/0/5/130552084/3ce8a6ad78d9.pdf
    • http://mightypharaoh.com/uploads/1/3/1/1/131164393/terms.html
    • http://mightypharaoh.com/uploads/1/3/1/1/131164393/dmca.html
    • http://mightypharaoh.com/uploads/1/3/1/1/131164393/policy.html
    • https://jolataluput.files.wordpress.com/2020/06/zubavogigokaninegofo.pdf
    • https://toxebep.files.wordpress.com/2020/06/74393852317.pdf
    • https://mopiwum.files.wordpress.com/2020/05/54629388193.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_off000058ba.bin
34292fe0574fb241d4ace98bc0de8d1a13295ea6c78b9a691a1cc1703519c9ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58BA 10540 bytes

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