Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ebbfa7dfd902d6e…

MALICIOUS

PDF

53.6 KB Created: 2020-03-29 02:48:09 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3234e4ee51e5f67533cd1a58a8ee9cc5 SHA-1: 4a9013a6a92da8f40661816851edad32839dc5d8 SHA-256: 8ebbfa7dfd902d6e6d2034b4f2355e60fb75e6b187d65ad92d62b3fb916d8681
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDFs hosted on various domains. This behavior is indicative of a link farm or SEO poisoning tactic, designed to drive traffic to a network of sites. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links supports this assessment. No scripts were extracted, and the document body content is largely unreadable binary data with some embedded URLs.

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://iweargreatness.com/uploads/1/3/1/4/131406062/131406062.html#formula+molecular+de+2+2+dimetilpropano
    • http://rikroshi.com/uploads/1/3/0/8/130813554/3291347.pdf
    • http://bcriversconsulting.ca/uploads/1/3/0/7/130775047/dorodarewori.pdf
    • http://www.byvernawonderlust.com/uploads/1/3/0/5/130551517/beligunudepowiludok.pdf
    • http://kesharper.com/uploads/1/3/0/4/130483158/xokutoxerapabikomu.pdf
    • http://www.gilleysnotaryservice.com/uploads/1/3/0/5/130551839/1d786ca3b8c.pdf
    • http://www.jminteriorpainting.com/uploads/1/3/0/5/130545185/wamujoxika.pdf
    • http://ohigholifedesigns.shop/uploads/1/3/0/5/130546657/jolojisuw.pdf
    • http://lkniche.com/uploads/1/3/0/7/130775659/8137057.pdf
    • http://cyndibeetravel.com/uploads/1/3/0/3/130313784/vomitunenitudure.pdf
    • http://ketotreats.org/uploads/1/3/0/8/130873741/roteziwitokuru.pdf
    • http://www.kalentaylorjournals.com/uploads/1/3/0/6/130621202/juditux.pdf
    • http://www.glorychurch.ca/uploads/1/3/0/8/130813648/lubakawizagik-doteb.pdf
    • http://www.corinelson.com.au/uploads/1/3/0/6/130620840/dijawosoxora.pdf
    • http://mail2.street-sharp.com/uploads/1/3/0/5/130550724/8667977.pdf
    • http://findmoneyhere.com/uploads/1/3/0/6/130639418/01484ce03885e8a.pdf
    • http://sosharks.com/uploads/1/3/0/6/130605472/fece1b.pdf
    • http://www.theassetcompany.net/uploads/1/3/0/5/130589371/8505971.pdf
    • http://trinitycoby.com/uploads/1/3/1/0/131069806/1dd7b33.pdf
    • http://mx.minatangoboutique.com/uploads/1/3/0/6/130620880/xuled_fonewokaperujin_lukelare.pdf
    • http://faithlikegravity.org/uploads/1/3/0/4/130483275/5ee2b.pdf
    • http://www.sonoratradingpost.net/uploads/1/3/0/8/130814310/ed5d7c03de961.pdf
    • http://herbalholistics.net/uploads/1/3/0/7/130775939/kafusagasuronin.pdf
    • http://stealthconsulting.com.au/uploads/1/3/0/2/130288364/9102312.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008077.bin
e63b488eeea597df6520b4b2bc0cb5a19c4fff23e66e2cc727c2beb31c94ae5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8077 11100 bytes
font_01_sfnt_off0000a572.bin
da97dc8f55f2e876e37ec892b469aea63618c59d1f39fb3088588c0c6717da98		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA572 2904 bytes
font_02_sfnt_off0000afc8.bin
9ab890d4d27036e818a17f6d3cd754739c047151a1b196ef51c3b3ecea758c95		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC8 16264 bytes

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