Malicious PDF — malware analysis report

Static analysis result for SHA-256 84139ced10c13212…

MALICIOUS

PDF

53.6 KB Created: 2020-03-26 13:09:20 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ad1a998bae085e09c98fdae3410873c3 SHA-1: 11df843b027a988708f8e3255c29f2c710a74360 SHA-256: 84139ced10c132122a3eff57dc29b15221913b76105e768555f483ceb41fb58f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded external links, indicating a potential link farm or SEO spamming operation. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URLs suggests an attempt to redirect users to potentially harmful content or phishing sites. No scripts were extracted, but the PDF structure itself is used to host and distribute these links.

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://dorset-bike-ride.com/uploads/1/3/0/5/130588827/130588827.html#delonghi+magnifica+xs+ecam23120sb+automatic+espresso+machine
    • http://timebillingandmore.com/uploads/1/3/0/6/130621443/gijejibi.pdf
    • http://t-ecmedia.com/uploads/1/3/0/5/130546497/jugiwijixexeri-xutilek-jaxiritediri.pdf
    • http://joyofageing.net/uploads/1/3/0/6/130604815/xexakodafubifumero.pdf
    • http://nobookingfee.org/uploads/1/3/0/8/130873914/jagabovupa.pdf
    • http://ethosforlife.net/uploads/1/3/0/3/130313686/suwuta.pdf
    • http://www.churchstrettontaxi.com/uploads/1/3/0/4/130476485/3a04e.pdf
    • http://mccookchurchofchrist.org/uploads/1/3/0/6/130620945/kibasada_pafuduf.pdf
    • http://www.maculturedentreprise.com/uploads/1/3/0/8/130813694/50cda0a399.pdf
    • http://barnesconstructionservices.net/uploads/1/3/0/6/130621772/xapisixemake-subekuvap-dategevi.pdf
    • http://vivalavida8.com/uploads/1/3/0/7/130738559/4374623.pdf
    • http://www.perchhomeandgarden.com/uploads/1/3/0/5/130589227/2752873.pdf
    • http://boldcupofcoffee.com/uploads/1/3/0/2/130289334/didobebegab-vosetisuzoxel-lujetemu-naxinufisof.pdf
    • http://technikwissen24.de/uploads/1/3/0/6/130639760/tatazogotamazaxiva.pdf
    • http://hodgsonsiteservicesltd.com/uploads/1/3/0/5/130540037/sabogeror-zevagenavaxifu.pdf
    • http://www.thecaptainslady.com/uploads/1/3/0/5/130545636/ff928b98a000d6.pdf
    • http://lesaints.com/uploads/1/3/0/2/130289290/8281433.pdf
    • http://phlixpix.com/uploads/1/3/0/6/130621446/felosuzojusej-kidexotejijuzi-sixamikit-pixefexugunukul.pdf
    • http://www.kyf2f.com/uploads/1/3/0/7/130739828/pigez-dubixibirenogud-poremutopedim.pdf
    • http://njoylifecoaching.com/uploads/1/3/0/4/130478314/496bd8150c18.pdf
    • http://mrhealy.com/uploads/1/3/0/2/130272281/mupozusexusas.pdf
    • http://canberrabirthservices.com/uploads/1/3/0/8/130873875/5866412.pdf
    • http://martinezpinestraw.com/uploads/1/3/0/2/130289773/805090.pdf
    • http://interdisciplinaryfamilyjusticeassociation-sv.com/uploads/1/3/0/2/130270931/fijamunodorim-xasepolub-tujukasevumono.pdf
    • http://nccsdk12.net/uploads/1/3/0/7/130738679/zefawawepetazer_kadugateruva_gogefatixab_wododotadizil.pdf
    • http://charliesblendedcreationz.com/uploads/1/3/0/5/130588635/zovekuzov.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009125.bin
a7391ef5178cf2f1b9402de7afc9e3b92c458fbc0f058cd3bd6207fd6755b9ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9125 8312 bytes
font_01_sfnt_off0000b0fc.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0FC 16036 bytes

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