Malicious PDF — malware analysis report

Static analysis result for SHA-256 e88ae4afd120a975…

MALICIOUS

PDF

52.6 KB Created: 2020-03-20 14:32:56 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 099b8dcc38b4c772fde9d3a05db77e68 SHA-1: 14fed77a375a75dc9246c3670668945fafdeb795 SHA-256: e88ae4afd120a9759f48a2f09adf66ee1184c4f58805a6e99b24a843a8d3ffd7
94 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, a technique often used for SEO link farms or to redirect users to malicious content. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, suggests a lure related to 'Cisco desde cero ccna 3 chapter 2 exam answers', likely to entice users to click on the numerous external 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://dancinggoatsanctuary.com/uploads/1/3/0/6/130604258/130604258.html#cisco+desde+cero+ccna+3+chapter+2+exam+answers
    • http://www.houisa.com/uploads/1/3/0/2/130289803/8761425.pdf
    • http://ozaymobilyadekorasyon.com/uploads/1/3/0/8/130873946/wuwov_kuralavugedanib_topezu.pdf
    • http://www.minnesotasbestkeptsecret.com/uploads/1/3/0/6/130604459/fugewelofefatit.pdf
    • http://www.independenteyesrc.com/uploads/1/3/0/6/130604522/jakedata.pdf
    • http://musictheoryhelper.com/uploads/1/3/0/4/130489367/2640172.pdf
    • http://samyouness.com/uploads/1/3/0/6/130639599/3556520.pdf
    • http://natalieanabaugh.com/uploads/1/3/0/6/130621421/numilomuxonamibudu.pdf
    • http://nancychartierstudios.net/uploads/1/3/0/5/130589090/9350897.pdf
    • http://www.grumpysink.com/uploads/1/3/0/4/130479312/selaxokifalarudawa.pdf
    • http://dimeto.com/uploads/1/3/0/2/130274109/1468858.pdf
    • http://dataforgood.design/uploads/1/3/0/4/130435947/pinabezezipa-lunifiwawelevi-guzusafamu.pdf
    • http://airarea.space/uploads/1/3/0/4/130483299/puwikineded.pdf
    • http://deedradee.com/uploads/1/3/0/5/130543166/nuvesukafomepovaw.pdf
    • http://liftedhi.com/uploads/1/3/0/5/130588297/d8a5ae8706e.pdf
    • http://barkingwithbutler.com/uploads/1/3/0/6/130604982/4978564.pdf
    • http://jesengineeringservices.com/uploads/1/3/0/7/130775259/lexuzokixojopifot.pdf
    • http://scotchplainschurch.com/uploads/1/3/0/2/130288006/genoxoma-tufewog-xanor-narezogo.pdf
    • http://reachforthestars.co/uploads/1/3/0/2/130272347/wosamumisod-gefone.pdf
    • http://www.alinakitchensandbedrooms.co.uk/uploads/1/3/0/6/130604723/pasexa.pdf
    • http://spydernetworkbusinesssolutions.com/uploads/1/3/0/6/130604566/tufogojezadise.pdf
    • http://daemaintenancerepairs.net/uploads/1/3/0/6/130604161/6674896.pdf
    • http://elevationlightingllc.com/uploads/1/3/0/9/130969593/paleve.pdf
    • http://rohanphilip.com/uploads/1/3/0/5/130540290/9814541.pdf
    • http://hostmaster.boatstories.co.uk/uploads/1/3/0/5/130540540/sudijazeputir-zasaganenotux.pdf
    • http://rohanphilip.com/uploads/1/3/0/5/130540
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0000a767.bin
3c5a73cea1da13cd082ff117dbbe8077f2fd4d78978ea49d58a21ff8c9f793b8		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA767 17888 bytes
font_00_sfnt_off00007b7c.bin
6da9c6166212df50d5c7251d9fcc19c407208bab5c5acebc362ae2a0ae431dac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B7C 9456 bytes
font_01_sfnt_off00009db7.bin
7863b829de04ea8b7f5be4d5dae43fa62182e7611f0c3a300d10b316d27db496		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DB7 2732 bytes

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