Malicious PDF — malware analysis report

Static analysis result for SHA-256 84023e520bef4495…

MALICIOUS

PDF

70.6 KB Created: 2020-04-03 21:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 7c6eceee16a1a866605df009896187e8 SHA-1: 043fe2925e3af7135c563a34f70652e3359d8e51 SHA-256: 84023e520bef4495d1ab4c1c15e8321473159ad12ffe302d0d23f892596c6a6a
136 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document may be attempting to trick the user into believing they need a password to access content, a common tactic for hiding malicious payloads. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://jandhrealtors.com/uploads/1/3/1/3/131379356/131379356.html#langman+13+edicion+pdf
    • http://charzfitness.com/uploads/1/3/1/1/131164012/7010408.pdf
    • http://wong-imports.com/uploads/1/3/1/3/131381924/3754443.pdf
    • http://verybigcookies.org/uploads/1/3/0/6/130605440/wifab.pdf
    • http://futurematterssecondchance.com/uploads/1/3/0/8/130813953/vurafemaxel-durerulamakine-xulubunifowix-juriwuzapip.pdf
    • http://hh-tuc.de/uploads/1/3/0/5/130544138/xejozaw-zekedaroru-zifuko.pdf
    • http://merlynsoftware.com/uploads/1/3/0/4/130435516/0151ddcb0f9.pdf
    • http://downtownequestrian.com/uploads/1/3/1/3/131383497/zesubiwab-jifarun-rafuzu-nibuzetas.pdf
    • http://avcanic.com/uploads/1/3/0/5/130551073/nenowe.pdf
    • http://birkdaleawards.com/uploads/1/3/0/4/130494871/detewejoxa.pdf
    • http://photopiakc-photobooths.com/uploads/1/3/1/3/131398085/004268.pdf
    • http://birminghampropainters.com/uploads/1/3/0/3/130313585/a6cda574ac.pdf
    • http://hi4andahalf.com/uploads/1/3/1/1/131163828/6336657.pdf
    • http://eastsidegracemerch.com/uploads/1/3/0/4/130476045/f8fbc74f71f382.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_off0000e10b.bin
c1432115b3ff694243c8dce1538ceadcc240fd718bf7cfb5388ca72b05b42444		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE10B 12848 bytes

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