Malicious PDF — malware analysis report

Static analysis result for SHA-256 0539943542b490f9…

MALICIOUS

PDF

66.2 KB Created: 2020-03-08 08:08:05 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ff2c6ff5ba4c2ccdaa3a119e411def83 SHA-1: d0775a524db2282cef7f4d14ba3b5d8532456be1 SHA-256: 0539943542b490f9f0c8ad87f936eb0cd33dcb0e42fe701a6b1f565819c68cd1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though heavily obfuscated, contains references to 'Google hindi input keyboard download' and numerous URLs, suggesting a lure to external content. The ML classifier also strongly indicated maliciousness.

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://vipgrouptravelseminaratsea.voyagerwebsites.com/uploads/1/3/0/6/130621496/130621496.html#google+hindi+input+keyboard+download
    • http://discourse-x.com/uploads/1/3/0/5/130588944/bawowase.pdf
    • http://arkheadshots.com/uploads/1/3/0/3/130313294/2640414.pdf
    • http://kevinzhou.org/uploads/1/3/0/8/130814909/2887458.pdf
    • http://mrlapta.com/uploads/1/3/0/4/130476778/mexegu.pdf
    • http://aspire-chiropractic.com/uploads/1/3/0/3/130379504/cd5ab44de30.pdf
    • http://nathannasbymusic.com/uploads/1/3/0/2/130270917/luzibaxa_gisewipuvadopu_gutesofubinemub_bujadaloximila.pdf
    • http://operationgringo.com/uploads/1/3/0/5/130588248/c108b482b15fb5.pdf
    • http://zaharapersonaldevelopment.com/uploads/1/3/1/0/131070753/nusegimapawibe.pdf
    • http://reportrenters.com/uploads/1/3/0/5/130539438/9610598.pdf
    • http://tarotshanti.com/uploads/1/3/0/2/130287839/b7628c64d74.pdf
    • http://urgenthousecalls.com/uploads/1/3/0/6/130621206/tebasubi.pdf
    • http://mobe-eze.com/uploads/1/3/0/5/130539446/3638258.pdf
    • http://fedorahosted.org/lohit
    • 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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007fcc.bin
9e11a7b808c6f077e77637e615a40b7398075e546a890fa14ee372fee823cb52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FCC 9444 bytes
font_01_sfnt_off00009998.bin
3354bd1b1beb1fc8c3719ff30769bd36d28cc2a2131eec0cee8334d9d35fa90b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9998 7996 bytes
font_02_sfnt_off0000b8c3.bin
1c5077d06db767fe56fb52f65ab8016afd5368128060e7173805edd268bd9a73		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C3 2040 bytes
font_03_sfnt_off0000c29b.bin
d4d97f20861cdeb0e757153e464e9beec368c1bfb00407e4e40065c7ac1e1eba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC29B 18868 bytes

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