Malicious PDF — malware analysis report

Static analysis result for SHA-256 aba44ca785339a0d…

MALICIOUS

PDF

45.1 KB Created: 2020-06-18 09:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cff5f9d6c76ffa33e86df007744a1478 SHA-1: aa6af67ffe01ea9f04f9a6793d85250a13b0cc65 SHA-256: aba44ca785339a0d8936065318b5f4b480372c1120baff9937941b10e1bbbd46
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains numerous external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm heuristic further supports this. The document body, though obfuscated, contains references to a 'Tc electronic c300 manual' and URLs, indicating a lure to external content.

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://reliableportfolios.com/uploads/1/3/1/4/131437765/131437765.html#tc+electronic+c300+manual
    • http://jiaduobaoyulechengwangzhi.br3h.com/uploads/1/3/1/6/131637743/32596.pdf
    • http://antivirus.peaksystemsgroup.net/uploads/1/3/0/4/130478360/d86e65f3ad8.pdf
    • http://signalmountainpest.com/uploads/1/3/0/5/130588827/1014741.pdf
    • http://narrowstickets.com/uploads/1/3/0/6/130620163/takem.pdf
    • http://thesnowremovalcompany.com/uploads/1/3/0/7/130739971/sarixeliru_vibol.pdf
    • http://mail.themarshstore.com/uploads/1/3/1/0/131070598/beburixelizemalas.pdf
    • http://ayayogaart.com/uploads/1/3/1/6/131636960/jodagetimunama.pdf
    • http://claytoncollierbrown.com/uploads/1/3/0/7/130776260/zavobojubopa.pdf
    • http://wjmcguire.com/uploads/1/3/2/3/132303370/3409227.pdf
    • http://emporium23.com/uploads/1/3/0/5/130545957/178f696b7a8b31.pdf
    • http://closerwithgod.com/uploads/1/3/1/4/131483420/7f65b16f9.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000070e7.bin
39b115f1dc86677980cbb51199ad550b0ab94b3182f651f34028568c73e6ef92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70E7 4904 bytes
font_01_sfnt_off0000816b.bin
27e7ef9181531182af39c228d33df92d5c525a13a650abab37d9d98d60e087a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x816B 12952 bytes

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