Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0b0b250f85f74c3…

MALICIOUS

PDF

39.9 KB Created: 2020-03-29 13:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 33701433704a07a91ae1fb57b5642406 SHA-1: 3d1b88a5e0d25bef1098cb42dd0529ce5a3825e2 SHA-256: c0b0b250f85f74c368984076a172f9669cbc8336269f606d48520d73ca9488ff
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, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. The document body contains text related to verb conjugations, but this appears to be a lure to disguise the malicious intent of directing users to numerous external URLs.

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://humannaturefoundation.com/uploads/1/3/0/5/130538816/130538816.html#ejercicios+modos+del+verbo+indicativo+subjuntivo+e+imperativo
    • http://hudsonriverproductions.com/uploads/1/3/0/4/130489175/ec562.pdf
    • http://johnmasello.com/uploads/1/3/0/6/130620893/muwesodifi.pdf
    • http://bergconstruction.org/uploads/1/3/0/3/130313728/751c02128e.pdf
    • http://martysmithphoto.org/uploads/1/3/0/5/130551218/4024611.pdf
    • http://eyekandy.shop/uploads/1/3/0/4/130435574/1a3330ea7.pdf
    • http://suvitinhbinhduong.com/uploads/1/3/1/0/131070719/2361334.pdf
    • http://suburbanwoodsman.com/uploads/1/3/1/0/131070149/875e45126a9d9.pdf
    • http://ledarskapsspel.se/uploads/1/3/0/9/130969823/kowugitekari_kazovuxir_jirexasebi_xuwoxuv.pdf
    • http://razahomesllc.com/uploads/1/3/0/7/130738635/364906.pdf
    • http://omgevingsboekdemerode.com/uploads/1/3/0/7/130740008/3010796847d7c90.pdf
    • http://britchap.com/uploads/1/3/0/5/130543364/faxorubo.pdf
    • http://allthis.org/uploads/1/3/0/2/130273804/8899988.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_off0000711d.bin
a6b7011319d32c093167d2ee4a07f445512640673df3726eae40b8ca9f6e147b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x711D 9832 bytes

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