Malicious PDF — malware analysis report

Static analysis result for SHA-256 58bc56f950f94e67…

MALICIOUS

PDF

39.1 KB Created: 2020-06-16 06:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d33b07433d7df989f5fcff88aae3adba SHA-1: 890b4b782792e3e477225c5d42354f36f34a51b0 SHA-256: 58bc56f950f94e67f957c97c5f9dad5b51329d37b561455aeb66091771d129ca
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious File

This PDF file was flagged by a machine learning classifier as malicious. It contains a large number of external links, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains text related to a 'Blackberry storm help guide', likely a lure to disguise the malicious intent. The presence of numerous external URIs indicates an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://dangerousfreedom.us/uploads/1/3/1/4/131452972/131452972.html#blackberry+storm+help+guide
    • http://mail.cbcautomotivedesign.com/uploads/1/3/0/2/130289649/rakomofemoxened.pdf
    • http://qingmang.coffee/uploads/1/3/0/6/130639423/06a33b3.pdf
    • http://thebakerymeadville.com/uploads/1/3/1/3/131380470/5c799836.pdf
    • http://sraetales.com/uploads/1/3/1/4/131483036/3611430.pdf
    • http://allopoisson.com/uploads/1/3/0/8/130874361/35d901a3c.pdf
    • http://hostmaster.cystitiscure.co.uk/uploads/1/3/0/7/130774999/3d30d51.pdf
    • http://celticheather.com/uploads/1/3/0/8/130814219/72f11d.pdf
    • http://alittlelessyoung.com/uploads/1/3/0/6/130603888/2000909.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e96.bin
7ba165fa50a9b20827186322683cf1f8048486d6aa2caa443491559e9be4d312		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E96 10176 bytes

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