Malicious PDF — malware analysis report

Static analysis result for SHA-256 644c73b516678be3…

MALICIOUS

PDF

44.9 KB Created: 2020-04-04 07:27:47 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3aea41c09dc774aeb5a973675a8189f8 SHA-1: 6964962b9776eeda9d1583263a383987a4def93e SHA-256: 644c73b516678be319420fb3f6904d7d5741553dfc6313ca9a0132ef311ef771
96 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded external links, a technique commonly used to create SEO link farms. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. The embedded URLs likely lead to further malicious content or phishing pages.

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://shontayeleonard.com/uploads/1/3/0/7/130740089/130740089.html#honor+exp+maplestory
    • http://mckenziemadeit.com/uploads/1/3/1/4/131452944/ragorigowimonaz.pdf
    • http://hansatoyscanada.ca/uploads/1/3/0/6/130639085/9768340.pdf
    • http://handyasiain.com/uploads/1/3/0/2/130274301/8422439.pdf
    • http://axar-cars.com/uploads/1/3/0/6/130639729/zirone.pdf
    • http://raesham.com/uploads/1/3/0/5/130543784/rujese_xozasefipabuke.pdf
    • http://lholmesnycschools.com/uploads/1/3/0/5/130588430/rekepelewadabofudi.pdf
    • http://farmingdaleforever.org/uploads/1/3/0/9/130968976/25dbda933e55.pdf
    • http://cottonginmuseum.com/uploads/1/3/1/3/131379017/4e9b7.pdf
    • http://yourtimetoshinepageant.com/uploads/1/3/0/2/130272283/duxifemudera.pdf
    • http://omgpokerrun.com/uploads/1/3/0/6/130621901/bomojojotux.pdf
    • http://ncsoundllc.com/uploads/1/3/0/3/130323930/2936703.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_off0000875e.bin
fd96ec7720ea4bc419d9bdca48e4865769525fe3a1fe92caa57ebaa7e44562dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x875E 8216 bytes

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