Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa85330bb9deef50…

MALICIOUS

PDF

50.6 KB Created: 2020-04-04 06:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2d7cf144497059b7f7b87c7c108209c9 SHA-1: 3c3235a43bd68f769f5af9f81055f0f3c24c6e8b SHA-256: aa85330bb9deef50d7ad0ee34410cade8579220f087c14b3f871e2f7303495f2
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 to other PDF files hosted on various domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. The document body text is corrupted, but the presence of numerous external links suggests a malicious intent to direct users to potentially harmful content or phishing sites.

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://livingstones-vdc.com/uploads/1/3/0/6/130639646/130639646.html#lenin+para+principiantes+rese%C3%B1a
    • http://eastfresnobgclub.com/uploads/1/3/0/5/130590373/jarofoxu-fagoneposomikat.pdf
    • http://mytmch.com/uploads/1/3/1/4/131409210/ramivukiran_sobipipekoxule_wutev_nozuxenaraferi.pdf
    • http://centroinar.com/uploads/1/3/0/2/130272426/c6c8002bcac3f8.pdf
    • http://thedebcap.com/uploads/1/3/1/4/131438282/saxofoluzo.pdf
    • http://brickstherapy.com/uploads/1/3/0/8/130873942/1035361.pdf
    • http://koolguysair.com/uploads/1/3/0/8/130814706/lobokod.pdf
    • http://classpersianas.net/uploads/1/3/0/2/130289196/3920051.pdf
    • http://3blossomscafe.com/uploads/1/3/0/6/130640063/tonomilijekoso.pdf
    • http://charleroichiropractic.com/uploads/1/3/0/2/130289201/806178.pdf
    • http://mcclatcheyassociates.com/uploads/1/3/1/4/131454859/2043808.pdf
    • http://cleevevehicleservices.com/uploads/1/3/0/7/130775942/ae4e586ae048.pdf
    • http://benyehudah.com/uploads/1/3/0/6/130621829/b50714c0c31.pdf
    • http://ackservicioslatinos.com/uploads/1/3/0/7/130776223/572d9.pdf
    • http://hamcamva.com/uploads/1/3/1/0/131070116/jejogevabo.pdf
    • http://enzoclothing.shop/uploads/1/3/1/3/131398215/lukudonipozi.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_off00009af4.bin
664e1f4fcf4f981cb90af2e92efaf39e89fd3839b3ee190f1b8a99e19f98ddeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AF4 8860 bytes

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