Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f511d5515e9564…

MALICIOUS

PDF

38.2 KB Created: 2020-03-28 03:21:18 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 261982543e056e397714c598e9f3f4fb SHA-1: bf31a97a49bd64dbc23f580f8344607678497d6d SHA-256: a1f511d5515e9564ca593add4f602d7527bc0da0752ad8a3c31c69de504083e2
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, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on different domains. The ML classifier strongly indicated maliciousness. The embedded document body text, though heavily obfuscated, contains references to URLs, reinforcing the link farm attack pattern. The primary goal appears to be directing users to a network of external sites, likely for SEO manipulation or to serve further malicious content.

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://pencilpenservices.com/uploads/1/3/0/5/130551262/130551262.html#in+a+banana+sour+cream+pancakes
    • http://this-andthat.com/uploads/1/3/0/5/130588749/1605911.pdf
    • http://browandlashboutique.com/uploads/1/3/0/8/130874128/dezumedi-molewo.pdf
    • http://ketopages.com/uploads/1/3/0/6/130620618/07ef9.pdf
    • http://amodernstitch.com/uploads/1/3/0/5/130551772/zugobipojepekow-xubenenugotesu-potamiguwe.pdf
    • http://jonahlusk.com/uploads/1/3/0/4/130435650/419db400cde.pdf
    • http://orcajewelry.com/uploads/1/3/0/7/130739016/degulojovez-kovalagipug-fusova.pdf
    • http://learnexploreandplay.org/uploads/1/3/0/7/130739806/95eabea415ab6.pdf
    • http://nileformwork.com/uploads/1/3/1/0/131070089/likutoramasikejega.pdf
    • http://vcalderonart.com/uploads/1/3/0/7/130775098/5035583.pdf
    • http://teachreadingnow.solutions/uploads/1/3/0/5/130590665/b30562fa3273.pdf
    • http://cleaalsip.com/uploads/1/3/0/4/130490977/pisolilaxuni.pdf
    • http://cyriousconsulting.com/uploads/1/3/0/7/130775247/a936f7f.pdf
    • http://bubblesandsudsco.com/uploads/1/3/0/7/130775921/5038151.pdf
    • http://shampoochesbt.com/uploads/1/3/0/6/130640059/terage-saritefoxezaxap-meruboxuvunanot-fodip.pdf
    • http://novacabinetanddecor.com/uploads/1/3/0/6/130639903/3220690.pdf
    • http://hthmconsulting.com/uploads/1/3/1/0/131070820/9ba86a9a6.pdf
    • http://beachclubproductions.net/uploads/1/3/0/4/130476866/57ee02.pdf
    • http://beaufortvacationrental.com/uploads/1/3/0/6/130621717/vinevin.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_off00006dd6.bin
6db35f70f5f2e4db519a95d696c749f22fcfee4e97a9f7bc5ee14de1bcdc7635
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DD6 7560 bytes