Malicious PDF — malware analysis report

Static analysis result for SHA-256 1936069e021426c6…

MALICIOUS

PDF

37.7 KB Created: 2020-03-29 11:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 20a12c629155b664036084d90392ed81 SHA-1: d0b122edce832d4addc230d6399a5003399e808b SHA-256: 1936069e021426c624409dc98ccb876ec440e38b6ebd53a8665324b7b5529978
96 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, indicating a link farm or SEO spamming operation. The ML classifier strongly flagged this PDF as malicious. The embedded URLs are likely used to redirect users to malicious content or phishing pages.

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://richter-family.rominastiebenphotography.com/uploads/1/3/0/7/130739829/130739829.html#planos+en+el+espacio+calculo+vectorial
    • http://ash-ann-collection.net/uploads/1/3/0/8/130813511/7d9f32.pdf
    • http://mta-sts.mail.thecornercupcoffee.com/uploads/1/3/1/4/131437005/2091767.pdf
    • http://ompf.us/uploads/1/3/0/6/130604949/kazewiras.pdf
    • http://rockin-dixiedairygoats.com/uploads/1/3/0/5/130589014/52ad7.pdf
    • http://oceanstatehandyman.com/uploads/1/3/0/2/130289476/c04f4f08.pdf
    • http://procraftcarts.com/uploads/1/3/0/4/130489604/kavaj-xepizuwu.pdf
    • http://lachat2019.com/uploads/1/3/0/8/130874646/xobotakudev.pdf
    • http://marktwainu.com/uploads/1/3/0/6/130604425/5505892.pdf
    • http://housekeepingmpls.com/uploads/1/3/0/5/130589302/65912ffcbf.pdf
    • http://shoppersreporter.com/uploads/1/3/0/8/130873732/d5e7de829.pdf
    • http://nadiacorson.com/uploads/1/3/0/7/130775622/tomiberexebu.pdf
    • http://rmrecovery.com/uploads/1/3/1/1/131163983/puxalobesif.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_off00006816.bin
250d0912f3d04ca9c2bce429775756df78b2ed3cbf173c6bbe60a2d7da620cc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6816 8688 bytes

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