Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f1d3fcdece9b879…

MALICIOUS

PDF

39.3 KB Created: 2020-05-13 08:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 29a1202ea1a96040a6e9d03b500e7a68 SHA-1: e91c2a629ee98f544c614425b84b0d06a813c3d8 SHA-256: 1f1d3fcdece9b879670edc49cb69d84663fbb87c3ab0d978c59f973107bc147e
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO abuse tactic. The document body, though heavily obfuscated, contains references to 'Wellbutrin medication information' and numerous URLs, indicating a lure to external content. The ML classifier strongly flagged this PDF as malicious, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior.

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://kalajarvenlomakyla.fi/uploads/1/3/0/5/130588280/130588280.html#wellbutrin+medication+information
    • http://thewordcures.com/uploads/1/3/0/4/130479082/6856802.pdf
    • http://veganhealthandbody.com/uploads/1/3/0/9/130969270/6271641.pdf
    • http://majesticwealth.net/uploads/1/3/1/4/131483153/a5df788b.pdf
    • http://chippedplatecatering.com/uploads/1/3/0/8/130814024/1415318.pdf
    • http://wordbywordcreativewriting.com/uploads/1/3/0/7/130739994/8521903.pdf
    • http://dollartank.net/uploads/1/3/1/4/131437774/7180050f5b72057.pdf
    • http://touchandpreach.com/uploads/1/3/0/5/130551618/e7fae.pdf
    • http://southernblingteam.com/uploads/1/3/0/7/130776864/75a6277a.pdf
    • http://deniseramsden.ca/uploads/1/3/1/4/131406535/jerubilugupumojafe.pdf
    • http://redtwinedesign.com/uploads/1/3/0/5/130539979/robali.pdf
    • http://ericbesnier.com/uploads/1/3/0/2/130270997/8666117.pdf
    • http://impressyourprofs.com/uploads/1/3/0/5/130543010/popajav.pdf
    • http://nancyjmiller.net/uploads/1/3/0/5/130590351/2a27ca863.pdf
    • http://jennthorpphotography.com/uploads/1/3/0/5/130545429/9310264.pdf
    • http://monalisatravelling.com/uploads/1/3/0/2/130289421/watalasupaxawuzag.pdf
    • http://mycyberphile.com/uploads/1/3/0/5/130589427/mosukagopolirog.pdf
    • http://torresferreira.com/uploads/1/3/1/0/131070645/8124751.pdf
    • http://jvremodeling.net/uploads/1/3/0/7/130740199/6626235.pdf
    • http://beebrighttutoring.com/uploads/1/3/1/3/131383609/paraboj_xoded_lirumizalonox.pdf
    • http://hillman-tech.com/uploads/1/3/1/3/131379525/fapapumuredin.pdf
    • http://digitalbizzness.com/uploads/1/3/0/7/130776872/toneveg.pdf
    • http://localorganica.com/uploads/1/3/0/5/130542936/6643117.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_off00006e45.bin
1129ae68d28d37dbf6d2ac4a6be45e0be8308572c51f36277883a1b76cef9d8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E45 10020 bytes

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