Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f3069d7d77ccf0…

MALICIOUS

PDF

45.3 KB Created: 2020-04-11 09:23:46 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 7e2843d469fc965623c55aa61a86d168 SHA-1: 46f1ce05a4b1e92a8cdb4ff5468a258da8adb8da SHA-256: 33f3069d7d77ccf06b2d90f3228c0e253407007926f40be8beae86c7ca42b13e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links to external websites, many of which follow a pattern indicative of a link farm or SEO spam. The document body, though heavily obfuscated, contains text that appears to be a lure for 'skills worksheet active reading'. The ML classifier strongly flagged this PDF as malicious, and the presence of many external links suggests an attempt to redirect users to potentially harmful content or further stages of an attack. No scripts were extracted, but the primary attack vector appears to be social engineering via document content and embedded URLs.

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://cpanel.ladse.org/uploads/1/3/0/8/130814190/130814190.html#skills+worksheet+active+reading+sect
    • http://amberwhistle.com/uploads/1/3/0/6/130603894/9416303.pdf
    • http://angelatyourdoor.com/uploads/1/3/0/5/130590478/796de50828f6.pdf
    • http://eleneongroup.com/uploads/1/3/1/3/131381078/bobeguduxutekuvo.pdf
    • http://thatholisticgirllife.com/uploads/1/3/0/4/130477085/sovebefukame_tonarafob.pdf
    • http://lockedsecurestorage.com/uploads/1/3/0/6/130604850/firidaremab.pdf
    • http://am21tech.com/uploads/1/3/0/2/130289213/340634.pdf
    • http://caressofhappiness.com/uploads/1/3/0/6/130639377/945049.pdf
    • http://liazonstudio.com/uploads/1/3/0/4/130488831/3588723.pdf
    • http://pathoflightwithin.com/uploads/1/3/1/1/131164046/genob.pdf
    • http://rootforcefitness.com/uploads/1/3/0/6/130621273/9102941.pdf
    • http://robertshrigleywoolf.com/uploads/1/3/0/6/130604161/5429033.pdf
    • http://tvshop-agency.com/uploads/1/3/0/7/130775455/tabuberizuzitu.pdf
    • http://splandit.nl/uploads/1/3/0/2/130289239/d90d36fc5b1.pdf
    • http://teterborologisticscenter.com/uploads/1/3/0/2/130291033/bikedodutun.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_off0000884f.bin
858f128721cc549e0a562c19d66abb96af19cd6932125b62027bae02ff8dfb71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x884F 8628 bytes

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