Malicious PDF — malware analysis report

Static analysis result for SHA-256 19cd3a27c5709bc5…

MALICIOUS

PDF

37.4 KB Created: 2020-05-30 13:17:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 37ab473c2f6625aea38d97b15a1a7d57 SHA-1: c749d58d0b6ab22b3ec99b2aae9c9e39888d81fb SHA-256: 19cd3a27c5709bc506a7856c17152072e3d8faba2c1d3f4404ccff9296157267
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, flagged by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The document body, though partially obfuscated, contains text related to 'Bulletproof ssl and tls' and includes URLs that are likely part of a link farm or phishing scheme. No scripts were extracted, limiting the analysis of direct payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://holdenmusic808.com/uploads/1/3/1/4/131483307/131483307.html#bulletproof+ssl+and+tls+by+ivan+rist
    • http://mta-sts.suzysnails.nl/uploads/1/3/0/5/130542734/bubanija.pdf
    • http://soloinsurancequotes.com/uploads/1/3/1/4/131483144/zomep.pdf
    • http://thebrilliantminute.com/uploads/1/3/0/2/130289315/widatejor_pajurabebo.pdf
    • http://hollycash.shop/uploads/1/3/0/5/130551445/vebukajum.pdf
    • http://prism-solutions.com/uploads/1/3/0/6/130621531/gujopatoneduw.pdf
    • http://monkeyfolio.com/uploads/1/3/1/8/131856316/weworivobez-wemagekakisew.pdf
    • http://kepnerfarmsjkjranch.com/uploads/1/3/1/8/131871910/jumovefa_fibivimama_jutudojuzifun.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_off00006193.bin
ce4ed5f506a9963e6127893986ee86615db3d29e86cbb8ab4ee6d003df3bd224		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6193 12708 bytes

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