Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1aa194bdfa7eab9…

MALICIOUS

PDF

43.2 KB Created: 2020-06-23 23:40:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1750c51f3c7e28277575daaecb302a80 SHA-1: 3dddfdd19295b88f888c85e09f129e4d0d99dd03 SHA-256: d1aa194bdfa7eab964f7ee0d7b545f5a29be086db665f9f5c473af03a05e1480
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains numerous external links, a common tactic for SEO spam and phishing. The document body, though heavily obfuscated, includes text related to 'Learn plc programming pdf' and several URLs, suggesting a lure to a malicious website. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm, indicating a likely attempt to drive traffic to potentially malicious content.

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://gethiredtoteach.net/uploads/1/3/0/6/130604369/130604369.html#learn+plc+programming+pdf
    • http://hostmaster.talkingtherapieslondon.com/uploads/1/3/1/6/131636748/tivuvivoset.pdf
    • http://lamariposatexas.com/uploads/1/3/0/2/130272862/xopiramefo.pdf
    • http://slowe.net/uploads/1/3/0/7/130740199/wukozoruwoles.pdf
    • http://parkinsonsworkingagegroup.org/uploads/1/3/1/8/131856184/kulebalofuzi.pdf
    • http://mail.marijkecoghe.be/uploads/1/3/1/4/131482968/6552773.pdf
    • http://millennialnator.com/uploads/1/3/0/6/130604823/1ad83.pdf
    • http://lauraleane.com/uploads/1/3/0/5/130588834/pakoxojipigivisenom.pdf
    • http://careerservice.online/uploads/1/3/0/6/130639348/nekunovi-gefebovir.pdf
    • http://ebikeakaroa.co/uploads/1/3/0/7/130776514/mosidepo.pdf
    • http://uncagedfitnesss.com/uploads/1/3/0/5/130539922/7878518.pdf
    • http://gotchawalt.club/uploads/1/3/0/8/130814070/wogidamifekofus_jotedu.pdf
    • http://296.undesirable.us/uploads/1/3/0/8/130873846/lupexerupam.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_off00006dbc.bin
8a22ac48de7063ed0fe57f07f35faaf0af0ddac402eea40ac8413e42a701b595		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DBC 4948 bytes
font_01_sfnt_off00007e67.bin
228b9a7f4488a253d7f46d60ea3bb35fa4462080336285fe32c82a91cf40df66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E67 10188 bytes

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