Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3683236d05817e6…

MALICIOUS

PDF

38.2 KB Created: 2020-06-02 19:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28265a97aa59c52b8429498d8b2909fe SHA-1: 62a6fef5758de5ceefd225d4df9813c697251d7b SHA-256: f3683236d05817e6b18683b49bbfa414a9d9d5ce2e2bdd5e3d779ef28183c7cc
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to similarly structured URLs on various domains. This suggests a link farm or a distribution mechanism for malicious content. The ML classifier strongly indicated maliciousness. The document body contains what appears to be a title and some metadata, but no clear user-facing text. No scripts were extracted from this sample.

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://seemorebargains.com/uploads/1/3/0/5/130540176/130540176.html#laboratory+5+cell+respiration+answer
    • http://harleesalazarphotography.com/uploads/1/3/0/4/130476744/fubitu_fomovaseti_bezeduri_laguzemogapo.pdf
    • http://lantzvilleproperties.com/uploads/1/3/1/8/131871572/eea76.pdf
    • http://mta-sts.mail.canicrossnederland.nl/uploads/1/3/0/9/130969143/kerofuk.pdf
    • http://hopemillsroadpharmacy.com/uploads/1/3/1/4/131438267/7848838.pdf
    • http://digitaltinkerings.com/uploads/1/3/0/2/130288731/wagil.pdf
    • http://74-123-75-45.mgwnet.com/uploads/1/3/0/5/130543134/aa188c5fe9bfa.pdf
    • http://beyoutifulbrains.com/uploads/1/3/1/4/131454238/0e3d88c.pdf
    • http://eriemarking.com/uploads/1/3/0/2/130272906/dizoxapoxib.pdf
    • http://seemorebargains.com/uploads/1/3/0/5/130540176/terms.html
    • http://seemorebargains.com/uploads/1/3/0/5/130540176/dmca.html
    • http://seemorebargains.com/uploads/1/3/0/5/130540176/policy.html
    • https://gokidomaj.files.wordpress.com/2020/05/pagapetulelapikumo.pdf
    • https://sukaligi.files.wordpress.com/2020/05/waduvawalod.pdf
    • https://jokurana.files.wordpress.com/2020/05/pojugudenukafukamabar.pdf
    • https://panoxovijudo.files.wordpress.com/2020/06/nekudob.pdf
    • https://vafofobowav.files.wordpress.com/2020/06/34178825703.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_off00006a76.bin
93ae777e0283765f0bec4ea74c69443f3817f209dc183ecfe5f1e5bfc98e1826		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A76 10416 bytes

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