Malicious PDF — malware analysis report

Static analysis result for SHA-256 15c8bf3a4f0e9dd0…

MALICIOUS

PDF

61.6 KB Created: 2020-04-23 00:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: af3c99ba7145b36a4cdf83dfacf26912 SHA-1: e09dc10ff5984af76dad9e1e7fa9799443257c48 SHA-256: 15c8bf3a4f0e9dd0163b580903172f9bb079fbbe6be03d0b355b94dac8183967
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to other PDF files, indicating a link farm designed to manipulate search engine results or distribute content. The ML classifier strongly flagged this PDF as malicious. The presence of embedded URLs and the heuristic for a link farm suggest the document is part of a larger malicious infrastructure, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maeganprovan.com/uploads/1/3/0/4/130475973/130475973.html#student+worksheet+climatological+data+adh+calculation
    • http://kaylasaul.com/uploads/1/3/1/3/131383207/ferekagetajim_wakuvonoko.pdf
    • http://paydaylendinginvestigation.com/uploads/1/3/1/4/131406390/latubup.pdf
    • http://diamondkeyteam.com/uploads/1/3/0/6/130620365/tozudobi-wimedumagam-zatuxadesuge.pdf
    • http://theblushingblossom.com/uploads/1/3/0/8/130813750/jawigizikemofer_goxutag_pogazoxofevuf.pdf
    • http://codyalbertross.com/uploads/1/3/0/2/130287513/saforotokobitev.pdf
    • http://nicolesmithenergy.com/uploads/1/3/0/3/130379528/wifofurumapafotev.pdf
    • http://googleinc.online/uploads/1/3/0/6/130621089/satozuwoxigosu.pdf
    • http://mrshowtimeexpressllc.com/uploads/1/3/0/5/130546118/xafafinujigedo.pdf
    • http://giftoffullness.com/uploads/1/3/0/6/130639199/lokigemo.pdf
    • http://jerrygarciaartmusic.com/uploads/1/3/0/8/130874120/namapom.pdf
    • http://datingbetweenthelines.com/uploads/1/3/0/4/130435577/d71ad8d73.pdf
    • http://www..pdf
    • http://wardsci.insectidentification
    • http://insects
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9e8.bin
88515d3629870d0f4f877847978f6c7ac0714f864f717dca2bff09488c95ea80		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E8 9800 bytes
font_01_sfnt_off0000de44.bin
1b3f82cd74c5b6671cc0c0d4a6c7877b74bb57ca469b2a61ef541918e41af838		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE44 2652 bytes

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