Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ad99017064de008…

MALICIOUS

PDF

43.4 KB Created: 2020-05-22 10:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e042a96523af7b010e998bb567105cc2 SHA-1: 15be29b7c25fc53dc2cc03dbdb56238ebc101554 SHA-256: 1ad99017064de008e6d1139d5174f9cc72189bbe503f88c5cb8c26f6e50b1e3b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, a technique commonly used for SEO poisoning to drive traffic to malicious sites. The ML classifier strongly indicated maliciousness, and the presence of a link farm heuristic further supports this. The document body contains text that appears to be part of the lure, including a reference to 'plan bus chambery' and metadata from wkhtmltopdf, suggesting it was generated programmatically to host these links.

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://webmail.justanothersunday.com/uploads/1/3/0/9/130969790/130969790.html#plan+bus+chambery
    • http://blog.claudiatrue.com/uploads/1/3/0/2/130291489/xevejejel_faxarudunedu_fuxesilitute_xasunoluzopotiw.pdf
    • http://noblegoldens.com/uploads/1/3/0/2/130273987/wosanugaxufovozir.pdf
    • http://icmlogistix.com/uploads/1/3/0/3/130379431/29d7d7.pdf
    • http://emeraldjanitorial.net/uploads/1/3/1/4/131438587/dulosep-zitaporab-patiloviro.pdf
    • http://hydrationlifestyle.net/uploads/1/3/1/4/131453097/gevuroxajofiku-fikadesubenetu-pinawu-tebenifinu.pdf
    • http://joinocms.org/uploads/1/3/0/7/130775828/c3feb5a0bc68e18.pdf
    • http://elovashot.net/uploads/1/3/0/2/130288386/3218716.pdf
    • http://beardskol.com/uploads/1/3/0/3/130313178/9119766.pdf
    • http://veerpaintings.com/uploads/1/3/1/4/131453176/2215057.pdf
    • http://due2u.org/uploads/1/3/0/2/130289158/lived_dobuked_petumuvoduje_filatulevakidi.pdf
    • http://mysoulsingsstudio.org/uploads/1/3/0/8/130814868/2ca75fd0a1421.pdf
    • http://teamroserealty.net/uploads/1/3/1/6/131607984/80546.pdf
    • http://maymaxonlineshop.com/uploads/1/3/0/7/130776535/lisezu_witarujiwuge_vabafime_vuxuzupogu.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_off00007521.bin
cfa68b35e70d283c82c21515156c2c9b8008c3676d4cc990f1711980eba683bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7521 14712 bytes

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