Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f4d8722cdce05c0…

MALICIOUS

PDF

100.7 KB Created: 2020-04-06 07:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 56faae9da77c2874a5507b6faca550a4 SHA-1: ba4ad06858aee40b6b0f24c8dd7e545bc4f6b0c2 SHA-256: 0f4d8722cdce05c0bc94e89e970c3d955e193a715620b59f1da9d5d8f4410667
136 Risk Score

Malware Insights

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

This PDF document contains numerous external links, a common tactic for SEO poisoning and directing users to malicious sites. The 'SE_MFA_LURE' heuristic indicates the document is designed to trick users into providing sensitive information, likely for credential harvesting. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://wendymcclain.com/uploads/1/3/0/7/130776724/130776724.html#indications+for+tc+99m+bone+scan
    • http://itoms.at/uploads/1/3/0/2/130292179/5022195.pdf
    • http://bwcleaning.net/uploads/1/3/1/4/131407377/8500505.pdf
    • http://propertymaintenancellc.net/uploads/1/3/0/3/130313702/bifabimev-fubined-zebusiboboji.pdf
    • http://protexincusa.com/uploads/1/3/0/4/130476573/wuvirar-bekinile-medax-mimogovira.pdf
    • http://premierenvirovision.com/uploads/1/3/0/9/130969959/genugim.pdf
    • http://dojoperformingarts.com/uploads/1/3/1/0/131070702/goburuku.pdf
    • http://windy-hill-village.org/uploads/1/3/0/7/130775766/442a8.pdf
    • http://moneygetajob.com/uploads/1/3/1/1/131163512/bafisoxelopiwi.pdf
    • http://ilonaaroma.com/uploads/1/3/0/5/130543552/2610809.pdf
    • http://buenavistawesleyan.org/uploads/1/3/0/3/130379291/fapiwi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001300a.bin
c7cb6cabcdec329c17140f6a0be3c30613e831ff05c138b4eb720e2922c8da49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1300A 6300 bytes
font_01_sfnt_off00013f2f.bin
1235411192af2f7f0f3b035d71ad55ef2e33bee26ad1ea5638399e3fb4a40b3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F2F 10564 bytes
font_02_sfnt_off000164df.bin
0053f443d8a6c3a4b680d102958b67598e9210d8f5e6d95bd4bc13264e896a34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x164DF 3252 bytes
font_03_sfnt_off0001706b.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1706B 16036 bytes

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