Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a66fbe4bf774d9…

MALICIOUS

PDF

60.2 KB Created: 2020-03-29 08:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: a3094c81cad128b3610f7f28ae30223d SHA-1: 7b75ad653039231cfccf885dab337cfdbd3dc60f SHA-256: c1a66fbe4bf774d97d0497ac146d46e44ea58f77fe6df104b0a55d6dc5bec0e2
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or a method to distribute malicious content. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, but the presence of numerous external URLs indicates a likely attempt to redirect users to potentially harmful websites.

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://74-123-77-90.mgwnet.com/uploads/1/3/1/4/131438556/131438556.html#las+profesiones+en+espanol+pdf PDF link annotation
    • http://nses.northsmithfieldschools.com/uploads/1/3/0/5/130590698/velonosute.pdfIn PDF document text
    • http://simplescribe.net/uploads/1/3/0/7/130775654/kuxitisazibuxu.pdfIn PDF document text
    • http://abovetumblerridge.ca/uploads/1/3/0/6/130604024/7536251281cddc.pdfIn PDF document text
    • http://palmettochapterofahna.org/uploads/1/3/0/2/130274301/6706191.pdfIn PDF document text
    • http://frontierpartnersllc.org/uploads/1/3/0/5/130551517/8298859.pdfIn PDF document text
    • http://tudoparafoto.com/uploads/1/3/0/3/130323767/vibixune-datomipabijad-wexifozatunegev.pdfIn PDF document text
    • http://www.autorickshaw.com.au/uploads/1/3/0/4/130490476/somunarinapewanaj.pdfIn PDF document text
    • http://openskydigitalmarketing.com/uploads/1/3/0/7/130739633/mitipalife.pdfIn PDF document text
    • http://cpanel.topdogobediencetraining.com/uploads/1/3/0/4/130476505/wibojewawade.pdfIn PDF document text
    • http://globaly.net/uploads/1/3/0/5/130540146/088d14c0d.pdfIn PDF document text
    • http://mindbodysoulllc.com/uploads/1/3/0/4/130476024/1564926.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9264 9628 bytes
SHA-256: a4dbfa2e373c6393ad492ac1dd36d202c7ec1a401b3cfedc22fb0715e4f3a57d
font_01_sfnt_off0000b493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB493 2768 bytes
SHA-256: 11eff0542ee112a7a4f3d5fa86892f13f7f7c80edb17354215cea33bb7714487
font_02_sfnt_off0000be59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE59 1708 bytes
SHA-256: 83459e82cebe561b9e65dda6a09953c9e35f75e5df0fa62a624e1833cc5b8086
font_03_sfnt_off0000c6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C0 17408 bytes
SHA-256: 480845afcd115f9107ba4133765aa210d084eb1b3e159c2f9304e1033bdefa67

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