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) First seen: 2020-09-24
MD5: cff5f9d6c76ffa33e86df007744a1478 SHA-1: aa6af67ffe01ea9f04f9a6793d85250a13b0cc65 SHA-256: aba44ca785339a0d8936065318b5f4b480372c1120baff9937941b10e1bbbd46
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs suggest a link farm or SEO spamming operation, potentially leading to malicious content or further compromise. 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://reliableportfolios.com/uploads/1/3/1/4/131437765/131437765.html#tc+electronic+c300+manual PDF link annotation
    • http://jiaduobaoyulechengwangzhi.br3h.com/uploads/1/3/1/6/131637743/32596.pdfIn PDF document text
    • http://antivirus.peaksystemsgroup.net/uploads/1/3/0/4/130478360/d86e65f3ad8.pdfIn PDF document text
    • http://signalmountainpest.com/uploads/1/3/0/5/130588827/1014741.pdfIn PDF document text
    • http://narrowstickets.com/uploads/1/3/0/6/130620163/takem.pdfIn PDF document text
    • http://thesnowremovalcompany.com/uploads/1/3/0/7/130739971/sarixeliru_vibol.pdfIn PDF document text
    • http://mail.themarshstore.com/uploads/1/3/1/0/131070598/beburixelizemalas.pdfIn PDF document text
    • http://ayayogaart.com/uploads/1/3/1/6/131636960/jodagetimunama.pdfIn PDF document text
    • http://claytoncollierbrown.com/uploads/1/3/0/7/130776260/zavobojubopa.pdfIn PDF document text
    • http://wjmcguire.com/uploads/1/3/2/3/132303370/3409227.pdfIn PDF document text
    • http://emporium23.com/uploads/1/3/0/5/130545957/178f696b7a8b31.pdfIn PDF document text
    • http://closerwithgod.com/uploads/1/3/1/4/131483420/7f65b16f9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000070e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70E7 4904 bytes
SHA-256: 39b115f1dc86677980cbb51199ad550b0ab94b3182f651f34028568c73e6ef92
font_01_sfnt_off0000816b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x816B 12952 bytes
SHA-256: 27e7ef9181531182af39c228d33df92d5c525a13a650abab37d9d98d60e087a4