Malicious PDF — malware analysis report

Static analysis result for SHA-256 79b1a68b6b2525e1…

MALICIOUS

PDF

37.1 KB Created: 2020-04-07 21:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 160e70ba2cf981cfa0d090cc1366e42e SHA-1: 8f87d06613a4cf4618a528540f1915ed3fc1fe72 SHA-256: 79b1a68b6b2525e17bf2adefc4b478921912f2af8ff257543274f92941b18e11
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs hosted on similarly structured domains. This suggests a link farm or SEO poisoning tactic designed to drive traffic to potentially malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior.

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://zameenskitchen.com/uploads/1/3/0/4/130477135/130477135.html#anatomia+de+pelvis+pdf
    • http://atlanticcity-bachelorparty.com/uploads/1/3/0/6/130620949/3dc811d8.pdf
    • http://eternalknot.org/uploads/1/3/0/2/130272319/6185823.pdf
    • http://thefencingmaestro.com/uploads/1/3/0/3/130323286/1505880.pdf
    • http://leaannlewis.net/uploads/1/3/1/4/131406379/8492477.pdf
    • http://trinityumcama.org/uploads/1/3/1/0/131071137/9102893.pdf
    • http://appealyourvadisability.com/uploads/1/3/0/7/130739907/lavip_xuratijada.pdf
    • http://hahculture.us/uploads/1/3/0/7/130776065/siwodi.pdf
    • http://celebratinggodscreation.org/uploads/1/3/0/4/130476277/pogez-nofoz-xerekazubumof.pdf
    • http://sylvasilver.com/uploads/1/3/0/8/130815008/3f7b7c949.pdf
    • http://botanicahomebody.com/uploads/1/3/1/4/131437880/5864015.pdf
    • http://bbrinvestment.com/uploads/1/3/0/7/130740257/nopokefefiro_vagefukobasofa_sevobowuwuvu_kivimebonekopus.pdf
    • http://nuernbergergrund.de/uploads/1/3/0/2/130272921/5175226.pdf
    • http://kidcaretakers.com/uploads/1/3/0/6/130620959/dajaruxivasefaw_loditezugav_sadolupo_sitekuvez.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_off00006896.bin
442b6b5471b08b11b805247a5b7ad080644086c9d468c477e3fcb8b24c0882ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6896 8044 bytes

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