Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b7f79638cf6c78f…

MALICIOUS

PDF

42.3 KB Created: 2020-03-15 01:13:05 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d395f79d2cf53aae6608fe96d4a066d8 SHA-1: 9a8525659189376c4af57765128848ba312a02f0 SHA-256: 4b7f79638cf6c78f134623b13eead0c23a4ac24739c3cfafaf326d263d1c8c59
94 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 malformed, contains a URL that matches one of the extracted links, suggesting a lure to external content. No scripts were extracted from this sample.

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://sales15-ip-phone.pleasingfood.com/uploads/1/3/0/7/130774999/130774999.html#1st+grade+writing+complete+sentences+worksheets
    • http://thelearnnplayhouse.com/uploads/1/3/0/6/130603828/sadozogofela.pdf
    • http://www.dawnthomasdc.com/uploads/1/3/0/5/130590567/foginamelupufa-givuji-gobumi-rabofotabek.pdf
    • http://www.lilianhaney.com/uploads/1/3/0/6/130620367/zonem_zanogawovemeja.pdf
    • http://yavalladiseno.cl/uploads/1/3/0/2/130289406/2a6ddfae4da8d.pdf
    • http://www.wayneoram.com/uploads/1/3/0/3/130324206/4033164.pdf
    • http://achieveyourgoals2015.com/uploads/1/3/0/4/130436125/1581041.pdf
    • http://www.thecryingblondegirl.com/uploads/1/3/0/3/130379074/3756330.pdf
    • http://naturalmedicine4children.com/uploads/1/3/0/2/130291712/2b79a5d36027a.pdf
    • http://hostmaster.health-and-wellbeing-week.co.uk/uploads/1/3/0/4/130476135/zawanajem.pdf
    • http://mothcrafted.com/uploads/1/3/0/8/130814340/lofes_zifoxisu_nebiwedolaja.pdf
    • http://livegirlreview.com/uploads/1/3/0/4/130476412/5069174.pdf
    • http://www.cloudeagle.com.au/uploads/1/3/0/6/130604725/8424243.pdf
    • http://www.k9-lifestyle.com/uploads/1/3/0/4/130488955/fanarita-sevem.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_off000066fb.bin
3d53e41ab3ca61fa013bf2f537f71df59f6e3c6fc37a059c4d7c4568c316a06d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66FB 8052 bytes
font_01_sfnt_off00008660.bin
0f23141ba94d37b49c53016ac63a9b008a6ac8e4c4656a8d80e6725f77750189		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8660 16140 bytes

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