Malicious PDF — malware analysis report

Static analysis result for SHA-256 e453204fe2353552…

MALICIOUS

PDF

37.8 KB Created: 2020-04-17 13:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 39dbb55661cd8c5dd5d4b500ed50acbc SHA-1: 5bb201e9f5cbc4765b7672658a813adcae787170 SHA-256: e453204fe2353552378800cdf2f09d78d44e91e9420997964cb15bfe3d6c7e9d
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 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 redirection scheme. The ML classifier also strongly indicated maliciousness. The embedded URLs, such as http://gemcityboochery.com/uploads/1/3/0/8/130814234/130814234.html#gopal+bhar+3gp+bengali+cartoon, are likely part of this scheme to lure users to malicious content.

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://gemcityboochery.com/uploads/1/3/0/8/130814234/130814234.html#gopal+bhar+3gp+bengali+cartoon
    • http://empoweredbytheword.org/uploads/1/3/1/4/131406154/nibij.pdf
    • http://teddyarrowz.com/uploads/1/3/0/4/130476244/7d57fde58bc7.pdf
    • http://coach-rob-oldenburg.de/uploads/1/3/0/2/130289532/8774954.pdf
    • http://minerhosting.at/uploads/1/3/1/3/131380754/1250620.pdf
    • http://advancedmedicalgroup.org/uploads/1/3/1/4/131453451/4114938.pdf
    • http://firsteathecake.com/uploads/1/3/0/2/130288483/pigovunawu.pdf
    • http://siloamspringbc.org/uploads/1/3/0/6/130620974/siganamo.pdf
    • http://pelvicpaincure.com/uploads/1/3/0/8/130874501/jesedixeseg_nipilunuda_dugunotane_vebegepe.pdf
    • http://markkennethwilliamsphotography.com/uploads/1/3/0/7/130776247/d62b80206b2.pdf
    • http://troymichiganhotels.com/uploads/1/3/1/0/131070161/105298.pdf
    • http://pacificoutdoorconceptsinc.com/uploads/1/3/1/4/131437914/wirobibovuvexir.pdf
    • http://teashidc.com/uploads/1/3/0/8/130874340/xudik-xilit.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000531d.bin
d4b1995afddeb3049f59196a682ac5b34fa07e6dab80d952f19294f0414bbce3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x531D 7240 bytes
font_01_sfnt_off00006f7f.bin
ba7d0af93a3be51c7d31793807b33c7627282b1769d4aa05a122a544b8480ddc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F7F 9672 bytes

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