Malicious PDF — malware analysis report

Static analysis result for SHA-256 224951b9e589612b…

MALICIOUS

PDF

39.1 KB Created: 2020-04-01 12:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: db5a22215c3a7ae0ed04d4b09076b36f SHA-1: 897c29953fa1539aba0d8938f4a73418fb3f94f7 SHA-256: 224951b9e589612b96f45c22e08050525ed05246f1d48ccc03d210dd0bf928bd
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on different domains. The ML classifier also strongly indicated maliciousness. This suggests a link farm or SEO poisoning attack, potentially used to distribute further malicious content or manipulate search engine results. No scripts were extracted, limiting the analysis of direct payload execution.

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://mobilebillboardssantaclara.com/uploads/1/3/0/6/130604428/130604428.html#mayor+o+menor+en+fracciones+homogeneas
    • http://ondeckhomeinspections.com/uploads/1/3/0/5/130589097/nurifazerujil-wevipe-winetupe.pdf
    • http://reedsofficebuildingcare.net/uploads/1/3/0/7/130776591/gabej.pdf
    • http://a3ossllc.com/uploads/1/3/0/2/130272328/92ec680cc1d4.pdf
    • http://reduzcatucintura.com/uploads/1/3/1/3/131398348/vipodofidona_kolibu.pdf
    • http://cpoconstruction.net/uploads/1/3/0/6/130639668/xikubozajubate-givane-wabukerefa-sajuwujiv.pdf
    • http://loadedheel.com/uploads/1/3/0/4/130476722/1239628.pdf
    • http://stadiumcatering.com/uploads/1/3/0/9/130969399/de7f9.pdf
    • http://amandagoldenpeace.com/uploads/1/3/0/4/130477009/cb1bd9bcbd1b1a.pdf
    • http://shwartzaag.com/uploads/1/3/0/9/130969346/7909484.pdf
    • http://thebambooretreat.com/uploads/1/3/0/2/130289476/badas.pdf
    • http://thecouplesplacesa.com/uploads/1/3/0/4/130489725/figamosufuziri-dagekew-javadoke.pdf
    • http://sparklingtulips.com/uploads/1/3/0/8/130814914/wojepiwupamovo.pdf
    • http://penningtonyoga.com/uploads/1/3/0/8/130874340/lonabixuxipu_zigubunuf.pdf
    • http://hartsyardnewtown.com/uploads/1/3/0/7/130776075/jokopaxufoz_lazefuz_kujegugunux.pdf
    • http://montessorilawrence.org/uploads/1/3/1/4/131437352/8103349.pdf
    • http://highscoreconsulting.com/uploads/1/3/0/6/130620494/c7d6e.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_off00006e30.bin
13a6ab1e42b63436d138e81a5bd00559546012dfb5e89779ee7739fc013b5a99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E30 8500 bytes

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