Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0fc4938b41ddf8d…

MALICIOUS

PDF

67.5 KB Created: 2020-03-26 14:42:49 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c7e35dccf9ba6f0a07389e3b0438394f SHA-1: 42fc47ab82de7aa946f276b7583cd84dbd44f5f5 SHA-256: c0fc4938b41ddf8d0e43ea1fc4978aa04a5c6a9146bae47b27dfaa10a08faad0
94 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection to malicious content. The ML classifier also strongly indicated maliciousness. The document body contains garbled text and a reference to calculating the area of a right triangle, likely a lure to disguise the malicious intent of linking to numerous external 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://maritasdesign.com/uploads/1/3/0/6/130640090/130640090.html#formula+para+sacar+area+del+triangulo+rectangulo
    • http://independentadultcarehomeassociation.com/uploads/1/3/0/8/130813135/9943960.pdf
    • http://canepallc.com/uploads/1/3/0/6/130604517/4689420.pdf
    • http://mhcchurch.org/uploads/1/3/0/4/130491852/jotefepo.pdf
    • http://www.designsbyjael.shop/uploads/1/3/0/2/130272853/danibilaboko.pdf
    • http://lavigant.com/uploads/1/3/0/7/130776279/1312820d75.pdf
    • http://littleloonz.com/uploads/1/3/0/6/130603855/1885728.pdf
    • http://www.eastnicolausffa.com/uploads/1/3/0/7/130775163/jopexo.pdf
    • http://www.walshengland.com/uploads/1/3/0/5/130540767/5501568.pdf
    • http://www.myvacationadventurescostarica.com/uploads/1/3/0/6/130639681/7904244.pdf
    • http://melanysaad.com/uploads/1/3/0/6/130605030/7549544.pdf
    • http://simplybright.net/uploads/1/3/0/8/130874219/7486414.pdf
    • http://californiaspiritscompany.com/uploads/1/3/1/1/131164474/f39095f978c4.pdf
    • http://dirainternational.co.uk/uploads/1/3/0/6/130640190/xizufideb_zalufosonodite.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c48.bin
3449b32310059fb206733777eff0c42c8a1fc4923af0ea7d21382e3abec35fe3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C48 13972 bytes
font_01_sfnt_off00008cc8.bin
f82bfafcf070cc115897dbefd9510222847a647f687cdd478e701b84af24118c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CC8 12624 bytes
font_02_sfnt_off0000b4b8.bin
695595e90fe1976e067c61d345d53ad0a308beb4940b9bde0adab2e9ecccfc0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B8 5968 bytes
font_03_sfnt_off0000c805.bin
3adcd2b8ebabefa5d6eeb0e13d7a79343c72f783a334d9de9d09f026b07e80fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC805 18600 bytes
font_04_sfnt_off0000e571.bin
6204aa9299f811ffbadc12a84b46a780f3b457f30111006905f3318cdf84a256		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE571 8460 bytes

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