Malicious PDF — malware analysis report

Static analysis result for SHA-256 21d166bfef972c7a…

MALICIOUS

PDF

38.8 KB Created: 2020-03-30 13:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1d9019925cba1c0bc6356e77966f8ce9 SHA-1: 58567a82446fb260a138172fbc59b5fcc8778dda SHA-256: 21d166bfef972c7a712ec4f98119e9e25cd71e6fc0067c41fba5ce90ace83d43
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to similarly structured URLs on different domains. The heuristic 'PDF_SEO_LINK_FARM' indicates this is a deliberate link farm, likely designed to manipulate search engine rankings or distribute traffic to malicious content. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted from this sample.

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://mymissblue.com/uploads/1/3/1/3/131384602/131384602.html#professional+soccer+training+plan
    • http://jessicag.online/uploads/1/3/1/0/131070598/rurugixubakiropojim.pdf
    • http://bloemboetiekhermien.nl/uploads/1/3/0/6/130604580/6308050.pdf
    • http://charlybrownsdream.com/uploads/1/3/0/5/130550729/nopodagoduragebonir.pdf
    • http://taunsighald.dk/uploads/1/3/0/2/130288549/kopavewoweriv_zituguw_wodoxujomox.pdf
    • http://victoriaeyes.com/uploads/1/3/0/5/130590126/a87ac4d6b5f0cd3.pdf
    • http://danishvillagekringle.com/uploads/1/3/1/4/131407571/b6a63fdfe3afdd.pdf
    • http://biggerpicture.us/uploads/1/3/1/1/131164027/ziferetanup.pdf
    • http://velvetwolf.com/uploads/1/3/0/6/130620943/vutajow.pdf
    • http://thirteen-tarot.com/uploads/1/3/0/3/130379674/5f4ba83338.pdf
    • http://bykatieblack.com/uploads/1/3/1/3/131383541/rasomab-mesuxilavafoli.pdf
    • http://carsmartautosalesllc.com/uploads/1/3/0/6/130605216/dipejejuzolukib.pdf
    • http://nolimitsrunning.org/uploads/1/3/0/8/130874523/9457859.pdf
    • http://greatdaneseleganceandgrace.com/uploads/1/3/0/2/130270982/juritufani.pdf
    • http://sproutstationery.com/uploads/1/3/0/6/130620565/paregivamori.pdf
    • http://barzaghi.org/uploads/1/3/0/6/130639407/giwomobazodub.pdf
    • http://asazukayaseniorportfolio.com/uploads/1/3/0/6/130621284/ligosugolenakidixavo.pdf
    • http://newfaithapostolic.org/uploads/1/3/0/6/130621979/gelajixerud.pdf
    • http://autodiscover.everyday-wines.com/uploads/1/3/0/7/130739117/lajiwotoguvakunu.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_off00006e8f.bin
3de47882c15e9450ebbc169cf73ee8bbac5c60c1fa5e4acc03ec14630de0ec90
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E8F 8060 bytes