Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b33b1cbed96be19…

MALICIOUS

PDF

41.9 KB Created: 2020-03-30 05:32:56 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0bd1b298d9fb8ce47feb87f99620f8a1 SHA-1: 5172d9d744e396b36bed7e57af22b02807206101 SHA-256: 1b33b1cbed96be195134aa60e36e38d0d618032bc39a29d0aa40cae93e67ca1d
94 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous external URLs embedded within its structure. The heuristic 'PDF_SEO_LINK_FARM' specifically indicates a mass of external PDF links, suggesting an attempt to manipulate search engine results or distribute malicious content through a large number of seemingly innocuous links. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves leveraging these links to redirect users to potentially harmful websites.

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://melbournehotelplaceholder.devsite-1.com/uploads/1/3/0/7/130740140/130740140.html#final+walk+through+before+closing+checklist
    • http://kindcabinet.com/uploads/1/3/0/7/130740117/8699587.pdf
    • http://masterchos-ata.com/uploads/1/3/0/4/130483949/2518612.pdf
    • http://thegreenteamservices.com/uploads/1/3/0/6/130604488/depusunu-rewegikinefuseb-gokuw-zomurifoxo.pdf
    • http://gladiatortaxservice.com/uploads/1/3/1/0/131070527/gatonux.pdf
    • http://kallibethartstudio.com/uploads/1/3/0/3/130323291/wujovoba.pdf
    • http://sr-studenica.org/uploads/1/3/0/6/130620975/xejabadenef-lomafe-bokop-pewijozot.pdf
    • http://elyprofessionalcleaningcorp.com/uploads/1/3/0/3/130313376/ec1e0eee136.pdf
    • http://phonespot.net/uploads/1/3/1/4/131454116/2321407.pdf
    • http://toplinecardio.com/uploads/1/3/0/7/130739022/2835618.pdf
    • http://gostrong.nl/uploads/1/3/1/0/131070161/kejej.pdf
    • http://thedenversocial.com/uploads/1/3/0/5/130550834/2861719.pdf
    • http://goshentrends.com/uploads/1/3/0/6/130640032/5899955.pdf
    • http://vlassolutions.com/uploads/1/3/0/5/130588650/kagitataxiwe_fizibewikiw_sukafutagumi.pdf
    • http://bebeautifullyconfident.com/uploads/1/3/0/4/130435988/60059e89.pdf
    • http://mingshanli.com/uploads/1/3/0/7/130775936/5ffe548ccf997f.pdf
    • http://abodeconvey.com/uploads/1/3/0/8/130815726/digoru.pdf
    • http://colleyvillehousepainting.com/uploads/1/3/0/6/130622111/4f305f27cac13.pdf
    • http://seldomimages.com/uploads/1/3/0/4/130489240/1716127.pdf
    • http://ga400portfoliofinancing.com/uploads/1/3/0/5/130544384/lezakagexim.pdf
    • http://cnichollswriting.com/uploads/1/3/1/1/131164569/284054.pdf
    • http://edenknight.com/uploads/1/3/0/6/130639439/wiluzaziwiruva.pdf
    • http://leylaismen.com/uploads/1/3/0/5/130588500/f944b7e703e2720.pdf
    • http://ericwilsongolf.com/uploads/1/3/0/5/130550834/4823735.pdf
    • http://peabodyyouthfootballandcheer.com/uploads/1/3/0/5/130539235/1542715.pdf
    • http://peabodyyouthfootballandcheer.com/uploa
    • 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_off0000796b.bin
83f689b7f940903fbb894866025a8629e7fc245d73d5662bdcb9f94b7412cd38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x796B 7836 bytes

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