Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce70c0dc397c884c…

MALICIOUS

PDF

32.6 KB Created: 2020-03-30 06:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2bbbc3447e57388a3e26943824a47f2c SHA-1: 27fb2fe71cbd9530e6854d6eee61cbf6f304e9dc SHA-256: ce70c0dc397c884c18c7b00e9f6c60bb43b069c8948920ce6941c05aa51247fb
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which follow a pattern of numeric slugs and appear to be part of a link farm. The primary lure is a fake PDF download, indicated by the document body containing text like 'Promenades 3rd edition pdf free'. The heuristic 'PDF_SEO_LINK_FARM' strongly suggests this is a technique to distribute malicious content or phish users. 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://webdisk.rodhillportraits.com/uploads/1/3/0/5/130539726/130539726.html#promenades+3rd+edition+pdf+free
    • http://verityfinancial.net/uploads/1/3/0/3/130323180/punafoxekaxu_larajosogu.pdf
    • http://lunazsalon.com/uploads/1/3/0/5/130589083/9091937.pdf
    • http://floatglassdesigns.com/uploads/1/3/0/6/130620679/493746.pdf
    • http://intesamma.com/uploads/1/3/0/3/130324164/rowizabadamopa.pdf
    • http://tristatek9university.com/uploads/1/3/0/5/130551094/gibevuwumofuvopo.pdf
    • http://blaufilmsaudiovisual.com/uploads/1/3/1/1/131164174/34245141.pdf
    • http://clearwaterhsmarinecorpjrotc.com/uploads/1/3/0/3/130379192/3171282.pdf
    • http://endallpacs.org/uploads/1/3/0/8/130814076/sowatewesuvisuzunig.pdf
    • http://spamavensav.com/uploads/1/3/1/3/131379059/7487888.pdf
    • http://franchisefoodie.com/uploads/1/3/1/0/131069789/tukamiriguwu.pdf
    • http://billing.themobilepcguys.com/uploads/1/3/0/7/130776078/wilibizedatelixijug.pdf
    • http://txspecialtyclaims.com/uploads/1/3/0/8/130874021/6393460.pdf
    • http://livingedgehome.com/uploads/1/3/0/6/130639959/9ec8b607.pdf
    • http://dynamichumancapital.org/uploads/1/3/0/9/130968961/xadiwazipixozosu.pdf
    • http://splintersrva.com/uploads/1/3/0/7/130775587/lafipini.pdf
    • http://rjroad.com/uploads/1/3/0/6/130604767/vududisemogupow.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_off000055e7.bin
cace2b2472dff9d3c277f7e847d55a1427a8daaa8ac629715705cdeab120d586		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55E7 7684 bytes

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