Malicious PDF — malware analysis report

Static analysis result for SHA-256 750227077d987da0…

MALICIOUS

PDF

45.8 KB Created: 2020-03-14 22:49:30 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0e6d63aa55048771803dc1ba66cfdaa2 SHA-1: d55af46bc71dbdf204d84d6f217ea6599916243a SHA-256: 750227077d987da0dd101e3154653da510d3b53849ad4d5496d3dbbaa91597e7
136 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links to external PDF files hosted on various domains. The heuristic 'PDF_SEO_LINK_FARM' indicates this is a link farm, suggesting the primary purpose is to manipulate search engine results or to serve as a distribution point for further malicious content. No scripts were extracted, but the extensive link farm and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://nenzhengqiandeqipai.br3h.com/uploads/1/3/0/2/130287456/130287456.html#best+answers+to+tell+me+about+yourself
    • http://montecristifinesouthamericanarts.com/uploads/1/3/0/5/130551700/1912189.pdf
    • http://www.browngirlfearless.com/uploads/1/3/0/7/130775199/tusarimixafoxeremu.pdf
    • http://galvanizemarketing.com/uploads/1/3/0/4/130476372/bibadoda-manika-guvitu-rovuvibekopef.pdf
    • http://teammonstersinthemaking.com/uploads/1/3/0/5/130588214/8d9bc062369.pdf
    • http://crafttestdummy.com/uploads/1/3/0/2/130271190/3593583.pdf
    • http://stacyfiehler.com/uploads/1/3/0/7/130775288/zatoj.pdf
    • http://graceinorder.com/uploads/1/3/0/8/130874119/zezukatederumoxoda.pdf
    • http://dustbuster.us/uploads/1/3/0/3/130323622/6494763.pdf
    • http://goodbabyformula.com/uploads/1/3/0/8/130873856/ecc618c1b53.pdf
    • http://downtheaisleweddingconsulting.com/uploads/1/3/0/6/130640044/7726112.pdf
    • http://greengardengobbl.com/uploads/1/3/0/6/130620843/fegofumonakovepu.pdf
    • http://marriottsap.com/uploads/1/3/0/2/130272477/1bda9abe.pdf
    • http://highperformancevegan.shop/uploads/1/3/0/4/130483194/lufixinivodijim.pdf
    • http://braintrainingspa.com/uploads/1/3/0/7/130738759/runiki.pdf
    • http://williamjoconnor.com/uploads/1/3/0/4/130435601/wolaseke.pdf
    • http://otleyart.com/uploads/1/3/0/6/130639450/pebisudabokadixa.pdf
    • http://sbinventions.com/uploads/1/3/0/6/130639643/sazipiw-vixowozate-gipalo-mogujitagaz.pdf
    • http://tarifgo.de/uploads/1/3/0/2/130287229/0a5bbf1e6b4a6e.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_off00008a58.bin
6c7b646a08c0ac6e0418637c07ef5cc868f860a4c6f17d77000717cdf3781466		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A58 8192 bytes

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