Malicious PDF — malware analysis report

Static analysis result for SHA-256 033b44f744f3d65b…

MALICIOUS

PDF

51.6 KB Created: 2020-03-08 07:23:31 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d504798a477f1cb744a19abdd38a47e2 SHA-1: a28e0368c45e99ca325534ead8c2f587b5886ba4 SHA-256: 033b44f744f3d65ba9554e0b09c9a5570fa8fa1edcf4769c3c4e62309c9140a8
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which appear to be dynamically generated, suggesting a link farm or SEO abuse tactic. The presence of a 'download button' lure and the ML classifier's high confidence score indicate malicious intent. The document likely serves as a lure to redirect the user to one of the embedded URLs, which would then host a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://agapibeach-akamaiorigin.devsite-1.com/uploads/1/3/0/4/130489343/130489343.html#debussy+deux+arabesques+no+2
    • http://www.asvhj.com/uploads/1/3/0/6/130639779/wugijixojopi_gawavazovimu_nezimevu.pdf
    • http://ssjohn832.com/uploads/1/3/0/2/130288571/9380028.pdf
    • http://www.cruisintheconejo.org/uploads/1/3/0/3/130323693/xuseferefi-napivatit-jakog-bisoxixuz.pdf
    • http://mtgrahams.com/uploads/1/3/1/0/131070437/vusodogafazej.pdf
    • http://twistingtrailsandtales.com/uploads/1/3/0/6/130620819/pogaxixijenez-zozefipusivupa-kolozib-batanutag.pdf
    • http://www.epochrepair.com/uploads/1/3/0/8/130814805/jofevilosome.pdf
    • http://wwwservicesdentaire.com/uploads/1/3/0/6/130639839/2996026.pdf
    • http://thesouthproperties.com/uploads/1/3/0/7/130739073/zatudojogoboxu-mateta.pdf
    • http://www.nutsandboltsofacrazylife.com/uploads/1/3/0/8/130813649/nomifibeg_laxebamotapon.pdf
    • http://rockymountaintoverlandexpo.com/uploads/1/3/0/7/130738755/7af9a4f2.pdf
    • http://livyclay.com/uploads/1/3/0/8/130814161/xewekikujuforuri.pdf
    • http://sparxelectricalcontractors.com/uploads/1/3/0/4/130488741/02bb3.pdf
    • http://digital-chicago.net/uploads/1/3/0/9/130969689/vetijajar.pdf
    • http://boutique.omorfiadiffusion.com/uploads/1/3/0/2/130274355/dobaxunozonago.pdf
    • http://www.edness.com/uploads/1/3/0/2/130273571/gemolewuxuxopiwowegu.pdf
    • http://www.emmarobbinsphotography.com/uploads/1/3/0/5/130543740/c6611393ab4f336.pdf
    • http://www.luckydoublesranch.com/uploads/1/3/0/5/130542710/2c7af7c0a34a13.pdf
    • http://droolydogclub.com/uploads/1/3/0/4/130436094/petetezijovibipozik.pdf
    • http://kitsuneraposa.com/uploads/1/3/0/7/130775503/1406284.pdf
    • http://alienscostumes.com/uploads/1/3/0/6/130620372/vevidi.pdf
    • http://dreams2travelkda.com/uploads/1/3/0/7/130740196/dudufagaxeziwo.pdf
    • http://amberbellemusic.us/uploads/1/3/0/3/130379902/nubivo_pijisameseka_xagoxupa_fegerozikikol.pdf
    • http://webdisk.pelletkorf.nl/uploads/1/3/1/0/131070776/6167293.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_off00008a57.bin
a432e24a2e05835d1aafe3913ccd074b2392ef6fdc1eac6adef56116afda2b46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A57 8576 bytes
font_01_sfnt_off0000aae8.bin
209a1914dac8e9aac3c16c0a9081bcc733128533442ca7fed933fc343c2e6065		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAAE8 16184 bytes

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