Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a7c3fd5419f00a1…

MALICIOUS

PDF

53.1 KB Created: 2020-04-26 23:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ab0f97f2773d0501cb951890d7be737a SHA-1: 293606735e942046ad290617a3953464b34aed36 SHA-256: 0a7c3fd5419f00a1ef512a29e0466eef312396a7b44da3b8692953b9621dde6b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to other PDF documents, suggesting a link farm or redirection mechanism. The ML classifier strongly indicated maliciousness, and the embedded URLs likely serve to redirect the user to malicious content or phishing pages. The document's apparent purpose is to trick users into clicking these links by masquerading as an audit plan example.

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://totallydreams.com/uploads/1/3/1/1/131163494/131163494.html#formato+plan+de+auditoria+interna+ejemplo
    • http://fastandeasyprocessing.com/uploads/1/3/0/6/130620274/fimatabavikuvus_tudijages_koboweduxibima.pdf
    • http://oneeyebig.com/uploads/1/3/0/5/130538981/67ce85370acbd.pdf
    • http://albinlawchartered.com/uploads/1/3/0/8/130874035/2905184.pdf
    • http://alivewithliv.tech/uploads/1/3/0/5/130550681/2155907.pdf
    • http://melissastewart.com/uploads/1/3/0/5/130539344/kefekoxozurimotubev.pdf
    • http://palmettoblufflegacy.com/uploads/1/3/0/7/130776699/6033032.pdf
    • http://activeshootersurvival.com/uploads/1/3/0/7/130739916/zafikomomi.pdf
    • http://consciousbitch.com/uploads/1/3/0/7/130739213/verufivevubuxavo.pdf
    • http://papasidou.com/uploads/1/3/0/8/130874683/farefo.pdf
    • http://bookboytreasures.com/uploads/1/3/1/3/131380625/415f0.pdf
    • http://scopeub.com/uploads/1/3/1/3/131398296/bimidibukigobenukaz.pdf
    • http://atemainc.cn/uploads/1/3/0/6/130603865/fodawoxavawu.pdf
    • http://blackwallstreetcapital.com/uploads/1/3/0/4/130488920/27a7ec158632.pdf
    • http://browenvi.com/uploads/1/3/0/5/130590159/difudukale.pdf
    • http://duluthvisit.com/uploads/1/3/0/6/130620334/558120eb9b510.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008f6a.bin
c3c46660ebbbc314ef32c17a8c91b34a9e10de9b57fc56a3abfbfa592b9fc542		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F6A 9424 bytes
font_01_sfnt_off0000b111.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB111 16036 bytes

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