Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9fc4889a7691688…

MALICIOUS

PDF

50.9 KB Created: 2020-03-26 07:08:15 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 24bc31e63eecd4ebb6907d6a334608f6 SHA-1: 8650e707afbf353c09afcdef6930382299d1e701 SHA-256: f9fc4889a76916882f172db0c935a51e8df2a6d2f63d0b5acc75cd947cca1fb7
96 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, pointing to various domains. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains some of these URLs, suggesting a deliberate attempt to direct users to external resources. No scripts were extracted, but the sheer volume of outbound links is highly suspicious and indicative of a link farm or distribution network.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://maeganprovan.com/uploads/1/3/0/7/130775221/130775221.html#como+aumenta+o+disminuye+la+energia+de+ionizacion+en+la+tabla+periodica
    • http://mywickedberry.com/uploads/1/3/0/5/130550722/lokapitudedo.pdf
    • http://propertyeyeny.org/uploads/1/3/0/7/130740060/62e4baf16.pdf
    • http://www.robynrees.co.za/uploads/1/3/0/8/130813447/83bc3fc261407f.pdf
    • http://globalmont.com/uploads/1/3/0/2/130273624/6921216.pdf
    • http://myspicydate.com/uploads/1/3/0/7/130776585/nisuwovidox.pdf
    • http://fairfieldsoftware.com/uploads/1/3/0/7/130738638/gometizumesu-jopunizu-jogew-lebaliribaja.pdf
    • http://generousandkind.com/uploads/1/3/0/7/130738933/1121028.pdf
    • http://lacinta.ru/uploads/1/3/0/9/130970008/f2de8a85412.pdf
    • http://weeblee.net/uploads/1/3/0/4/130488227/4666293.pdf
    • http://www.dorjeetseringnang.com/uploads/1/3/0/3/130323526/4243363.pdf
    • http://kcpmf.com/uploads/1/3/0/5/130588560/tejafibefuragu-bamanudexagot.pdf
    • http://disarmfilm.com/uploads/1/3/0/7/130776852/gunaribugugav.pdf
    • http://oklahomaraw.com/uploads/1/3/0/8/130874524/lanedajupanumoranix.pdf
    • http://lyubaganin.com/uploads/1/3/0/9/130969541/1194298.pdf
    • http://www.lauradforman.net/uploads/1/3/0/2/130274319/1655749.pdf
    • http://betterwithfreedom.com/uploads/1/3/0/7/130740222/nagotaxakovuzexigo.pdf
    • http://mail.dmcicondosales.com/uploads/1/3/0/6/130639743/f5e09d78.pdf
    • http://charliewemyssdunn.com/uploads/1/3/0/7/130775192/7688361.pdf
    • http://leaesthetics.org/uploads/1/3/1/0/131071066/d85fc5801663.pdf
    • http://reachnearbycells.com/uploads/1/3/0/8/130874458/aa8cce4235eef.pdf
    • http://ddct-24-4-crs-4g-100m.pleasingfood.com/uploads/1/3/0/8/130813876/2580548.pdf
    • http://meroveo-upower.store/uploads/1/3/0/5/130588581/mevumok_mizok_suxebexidazek_gofir.pdf
    • http://thelegendspanel.com/uploads/1/3/0/6/130639017/3627537.pdf
    • http://mrtotallyrelevant.com/uploads/1/3/0/6/130621315/fc403bce5e57e.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000790f.bin
de993323c2add104cd2d348cefdc560265e813a87339a2b2e70703ce8ca5ae35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x790F 9532 bytes
font_01_sfnt_off00009ba2.bin
0ef1112e50e2a86488aadde4d8a477a3649c66578d8f2a84f2c6ad20bbddbbf8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BA2 2732 bytes
font_02_sfnt_off0000a54f.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA54F 16036 bytes

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