Malicious PDF — malware analysis report

Static analysis result for SHA-256 455f02bea8b9363c…

MALICIOUS

PDF

43.2 KB Created: 2020-04-02 18:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: eaff5f8e08300114e6df86ebf1850ba2 SHA-1: 7ccb6525cff90d9ab8303aaf508f1d70da8c0471 SHA-256: 455f02bea8b9363cf382d9ed9106004909b7fbaa93b5f0686d866cc67b11a26b
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, many of which point to domains with numeric or generic slugs, indicating a potential link farm or SEO spam operation. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of numerous external URLs suggests a delivery mechanism for further malicious content or phishing pages.

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://pooltimecleaningservice.com/uploads/1/3/0/6/130639385/130639385.html#librenms+alert+templates
    • http://uminnesotamap.com/uploads/1/3/1/0/131071035/jixadepixupoje_zofiwopevif.pdf
    • http://joestacocart.com/uploads/1/3/0/4/130488398/regajidata_dusepawalinifam.pdf
    • http://pioneergeneralcontracting.com/uploads/1/3/0/4/130483385/7207861.pdf
    • http://heart2heart.shop/uploads/1/3/0/5/130551417/3680929.pdf
    • http://gchac.net/uploads/1/3/0/5/130541313/bitotofuzeforin.pdf
    • http://highlysensitivecreative.com/uploads/1/3/0/8/130814121/6165785.pdf
    • http://eastgrandlanes.com/uploads/1/3/0/6/130620471/nenafusutupiwa-zumijagod.pdf
    • http://grand-fruits.com/uploads/1/3/0/7/130739020/5ce03.pdf
    • http://frezell.ca/uploads/1/3/0/2/130273812/bovefepilamax-gileverev-runaw.pdf
    • http://feliperenato.com/uploads/1/3/0/7/130776351/sazabopaxanitevix.pdf
    • http://postpartumdepression.support/uploads/1/3/0/6/130639563/kavidaki.pdf
    • http://stalvanmourik.com/uploads/1/3/0/5/130588380/1957970.pdf
    • http://dumornay.org/uploads/1/3/0/5/130551335/sosumakud.pdf
    • http://digitaltechnologieswa.com/uploads/1/3/0/4/130488847/digoluv.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_off000072de.bin
27f1713a0e1e1e2bf4d4c274386630dd730e63cd4af4c6daa980c7cf8756f1b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72DE 8636 bytes
font_01_sfnt_off000093fc.bin
8b6580eb7e18fde2b368b9fa166a7c4083fb741d140892367d10ed76c63f30df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93FC 2944 bytes

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