Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e1939a68b49d40…

MALICIOUS

PDF

42.4 KB Created: 2020-04-02 05:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2dd8b0e05b6f3846b2bdbf0694565766 SHA-1: 545380fa487d32610f24fb1c5c06edc212c7d06b SHA-256: 28e1939a68b49d400031f967720308a8f61c79e1d02d76f1c6dd3889a4e00584
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a common technique for SEO poisoning or phishing. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains a URL related to 'Dell latitude e5400 power problems', suggesting a lure to a fake support page or a scam. The primary attack pattern involves directing users to a network of suspicious domains.

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://relocities.com/uploads/1/3/0/5/130538987/130538987.html#dell+latitude+e5400+power+problems
    • http://neatshaving.com/uploads/1/3/1/3/131382439/4006433.pdf
    • http://hairstylistasheville.com/uploads/1/3/0/7/130775889/vetuwojora.pdf
    • http://metalslitter.com/uploads/1/3/0/5/130550697/jazegapakidu_wajeka_fekadajexobak_gumadiw.pdf
    • http://mississippimolly.com/uploads/1/3/0/7/130775928/xotoliwakavi.pdf
    • http://big-boss-money.com/uploads/1/3/0/8/130813934/pumejebida-mavufunaruj.pdf
    • http://kandisandcoboutique.com/uploads/1/3/0/6/130639855/76dafa.pdf
    • http://musiconnection.org/uploads/1/3/1/3/131380078/tofurejoxenafasuv.pdf
    • http://coltondaffern.net/uploads/1/3/0/8/130874088/3589289.pdf
    • http://rachiebuckleybeauty.com/uploads/1/3/0/6/130639658/5846211.pdf
    • http://palmettopreswic.org/uploads/1/3/0/5/130540214/6824731.pdf
    • http://justinsteimle.com/uploads/1/3/0/5/130590564/e894bebfcd0456a.pdf
    • http://missygotcakes.com/uploads/1/3/0/4/130476501/798aa3356b0047f.pdf
    • http://dthree.net/uploads/1/3/1/3/131383424/nisufonebabosiriko.pdf
    • http://bartschcchs.com/uploads/1/3/1/3/131383943/vadogagiwolinafex.pdf
    • http://apopkasrcreenenclosures.com/uploads/1/3/0/4/130478760/neduv.pdf
    • http://riquelmebraga.com/uploads/1/3/0/7/130775606/furizasumawebojazadu.pdf
    • http://questinternationalstudentservices.com/uploads/1/3/0/4/130490833/golonalu.pdf
    • http://freeapps-mobilesports.com/uploads/1/3/0/3/130313196/7727753.pdf
    • http://onepointsixoneeight.net/uploads/1/3/0/6/130639379/5d8745.pdf
    • http://sprucecase.com/uploads/1/3/0/8/130874498/xolaxajimiwadevu.pdf
    • http://clconstruction413.com/uploads/1/3/0/3/130323227/duvupiforinetegi.pdf
    • http://ellcclub.com/uploads/1/3/1/0/131069863/6972883.pdf
    • http://gwenjacksonstories.org/uploads/1/3/0/9/130969065/800178.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_off00007b5c.bin
49367198e585eb2fded2b26a2766dea012a5d40d7ae6e663efe9e87acd9cea74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B5C 8012 bytes

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