Malicious PDF — malware analysis report

Static analysis result for SHA-256 406a290c73997377…

MALICIOUS

PDF

27.6 KB Created: 2020-06-03 10:39:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4000c6c2abe9cb0bc1e9696f7348c4f SHA-1: 53cb7039c522d946b324d382843cfb0080499ee7 SHA-256: 406a290c73997377cd23ca4364b2724426d251f3006d50bc575339415a42d9c2
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF file contains numerous external links, a common tactic for SEO spam or distributing malicious content. The heuristic PDF_SEO_LINK_FARM specifically flags this behavior, indicating a large number of external links hosted on various domains. The document body, though partially corrupted, contains text suggesting it is a worksheet, which serves as a lure to click on the embedded links. No scripts were extracted, but the high ML_NYX_PDF_MALICIOUS score and the link farm heuristic strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://uncannyvalleys.com/uploads/1/3/0/8/130814597/130814597.html#synthetic+division+worksheet+with+answers+pdf
    • http://amandaanneplatt.com/uploads/1/3/1/8/131857695/1777968.pdf
    • http://specialty-renal.com/uploads/1/3/0/5/130540176/4250304.pdf
    • http://lymitlesshealth.com/uploads/1/3/0/6/130603760/kobomepaboluvob-pimogano-nulitive-jiten.pdf
    • http://michellewhyman.com/uploads/1/3/1/4/131437531/zasuleze-kebaniliwofowi-nukizivopekemud.pdf
    • http://mail.tom.alifeexplored.com/uploads/1/3/1/4/131438501/2185264.pdf
    • http://uncannyvalleys.com/uploads/1/3/0/8/130814597/terms.html
    • http://uncannyvalleys.com/uploads/1/3/0/8/130814597/dmca.html
    • http://uncannyvalleys.com/uploads/1/3/0/8/130814597/policy.html
    • https://suxeniruwip.files.wordpress.com/2020/05/muberupadizusali.pdf
    • https://puzedewufo.files.wordpress.com/2020/06/konunawavafagowokajox.pdf
    • https://samudazekami.files.wordpress.com/2020/05/jatixe.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_off00004571.bin
bda119e85b8b047ebd0c1614058344e1c81d0898971ea6dfd5bf610de73c645b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4571 8764 bytes

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