Malicious PDF — malware analysis report

Static analysis result for SHA-256 acababba32d75df2…

MALICIOUS

PDF

53.6 KB Created: 2020-06-03 11:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3766a0f9f7a34f3e41fcb644eeb737cf SHA-1: a234dd5534d6ffcad826cce7aaebe61a38308339 SHA-256: acababba32d75df2df50e2911b35cc0030f9e049ce4d213a93e666fcd50a0527
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF documents hosted on different domains. The ML classifier also strongly indicated maliciousness. This suggests the document is part of a link farm or SEO manipulation scheme, potentially designed to distribute malware or engage in phishing by directing users to malicious sites.

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://4pxt5.bpmtc.com/uploads/1/3/0/9/130969089/130969089.html#portrait+de+l+artiste+en+jeune+homme
    • http://kofone.com/uploads/1/3/1/4/131452870/jamata.pdf
    • http://holloproductions.com/uploads/1/3/0/5/130551399/eb4db69fc20e.pdf
    • http://stylesheetz.org/uploads/1/3/0/7/130775215/wuxubupope.pdf
    • http://1cv.undesirable.us/uploads/1/3/0/5/130588939/6ecf09175.pdf
    • http://a1073144xstreamtravel.xsideas.com/uploads/1/3/1/1/131164097/5970fdc122f8.pdf
    • http://mx.idealconstructiongroup.com/uploads/1/3/0/7/130740563/wojitofixevimuf_lovokiv.pdf
    • http://email.rightjoin.com/uploads/1/3/0/4/130483508/pikudutid.pdf
    • http://priorityonesearch.net/uploads/1/3/0/7/130776346/392f7eea924.pdf
    • http://4pxt5.bpmtc.com/uploads/1/3/0/9/130969089/terms.html
    • http://4pxt5.bpmtc.com/uploads/1/3/0/9/130969089/dmca.html
    • http://4pxt5.bpmtc.com/uploads/1/3/0/9/130969089/policy.html
    • https://xokiwija.files.wordpress.com/2020/06/97646925889.pdf
    • https://befevimupa.files.wordpress.com/2020/05/38165462381.pdf
    • https://pawozejimuf.files.wordpress.com/2020/05/84710941453.pdf
    • https://rekinirive.files.wordpress.com/2020/06/71386977381.pdf
    • https://dufuzosug.files.wordpress.com/2020/06/xokaxox.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008581.bin
b2294d925450a7012c6f3e6a157a65d46deed746eefcfc6dc4ec002427b76b40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8581 15160 bytes
font_01_sfnt_off0000b333.bin
c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB333 16204 bytes

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