Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd30b88e7793fb5d…

MALICIOUS

PDF

37.8 KB Created: 2020-05-21 13:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 233022cad8ab904319b45061bfbd795c SHA-1: 8a1e495f00488b9c6bccbc5436de760a3a715991 SHA-256: bd30b88e7793fb5d3f43dbd4c1a0760f7de2a57e0cc81d19a7fff9f44c1075e8
96 Risk Score

Malware Insights

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

The PDF document is identified as malicious by an ML classifier and contains a large number of external links, many of which are numerically or generically named, suggesting a link farm for SEO manipulation. The document body, though obfuscated, contains text related to a 'grad school letter of intent' and includes several of the extracted URLs, indicating a social engineering lure to encourage users to click on these links. No scripts were extracted, but the sheer volume and nature of the links point to a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://blendedbeautyts.site/uploads/1/3/1/4/131409557/131409557.html#example+grad+school+letter+of+intent
    • http://gisouareinvest.com/uploads/1/3/0/5/130588672/barasikugubize.pdf
    • http://draingeek.com/uploads/1/3/0/2/130272086/5d2dc50db.pdf
    • http://vrweekly.us/uploads/1/3/0/4/130488181/punasamuwi-zalaxutem-pagobimu-polukuvikelu.pdf
    • http://officeevo.net/uploads/1/3/1/4/131410007/5822395.pdf
    • http://fivehonet.com/uploads/1/3/0/4/130436389/4928531.pdf
    • http://amazon-dark.com/uploads/1/3/0/4/130476351/9285769.pdf
    • http://katarinapejovic.com/uploads/1/3/1/4/131408899/defifemonupiwiv.pdf
    • http://prometheanliving.net/uploads/1/3/0/3/130313491/9938308.pdf
    • http://truthaboutbellinghambaptistchurch.net/uploads/1/3/1/3/131380848/xamuzufibegod.pdf
    • http://bellayume.com/uploads/1/3/0/5/130589413/7346852.pdf
    • http://nwasaltroom.com/uploads/1/3/0/2/130272470/42f52cabc14.pdf
    • http://buybuyama.com/uploads/1/3/0/3/130313166/fawilinogugivixara.pdf
    • http://rockthedam.net/uploads/1/3/0/2/130272086/326c797b809a.pdf
    • http://denniceyoga.com/uploads/1/3/0/7/130739491/kimifopasu_fowunovir_furexajufewu.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_off00006666.bin
5c63ec8c9f0f54846b2ac8e133a47b1cdc381d598c46f64e0465e4e90f17b66f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6666 11040 bytes

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