Malicious PDF — malware analysis report

Static analysis result for SHA-256 821bc84b419e64ee…

MALICIOUS

PDF

39.5 KB Created: 2020-03-21 03:04:22 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: bb2e3b9ecee0dc19f736c56be0266195 SHA-1: 745c285a8961f58aa852a4b49017439e43b19b37 SHA-256: 821bc84b419e64ee29f512fe5710d2f0ef0e70d978ccb191ebe44db9c4521d69
92 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 similarly structured URLs on different domains. This suggests a link farm or SEO spam operation. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body is heavily obfuscated, making it difficult to determine a more specific attack pattern beyond link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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
  • 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://deniseingrammd.com/uploads/1/3/0/9/130969702/130969702.html#modelado+de+sistemas+din%C3%A1micos.+aplicaciones
    • http://hearthandsbody.com/uploads/1/3/0/7/130774962/5859181.pdf
    • http://ricreativity.org/uploads/1/3/0/4/130483412/031d69faf799.pdf
    • http://patriotkatzmainecoon.com/uploads/1/3/0/4/130492038/giravusowevap_rowenapuwuzepag_pubutigakupoluz_kajinu.pdf
    • http://www.lowertechnology.com/uploads/1/3/0/2/130287989/fojugatogo.pdf
    • http://supremecupcakez.com/uploads/1/3/0/6/130621461/4036646.pdf
    • http://onembiss.com/uploads/1/3/0/3/130379118/3edfa323c58.pdf
    • http://bacchusbarua.com/uploads/1/3/0/6/130603776/64a7fd7f48.pdf
    • http://mediesjef.com/uploads/1/3/0/7/130776218/pekuruxapituf_beliworat.pdf
    • http://nlightnstudio.com/uploads/1/3/0/7/130738527/petakidabupusor.pdf
    • http://www.pulleyautoparts.com/uploads/1/3/0/7/130776724/6810893.pdf
    • http://wolfgrammatuladmp4.com/uploads/1/3/0/4/130483491/fejowoweb-digizivi-gufenoj.pdf
    • http://cuttingedgelawncare.org/uploads/1/3/0/5/130540477/7862719.pdf
    • http://thebakerymeadville.com/uploads/1/3/0/5/130588606/2acda04490fe.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_off00005c13.bin
21d5f4aa13d5da5e1f757283e9bdc1e6e95ef76298dd48cf867705c8a9b8da59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C13 7936 bytes
font_01_sfnt_off00007947.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7947 16036 bytes

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