Malicious PDF — malware analysis report

Static analysis result for SHA-256 7011ed2be58c1050…

MALICIOUS

PDF

39.7 KB Created: 2020-04-01 14:39:29 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b484753a9190d3fba3dec3b0565f7e87 SHA-1: f3a6b588429a982035c59d60878dbe271e247f8d SHA-256: 7011ed2be58c1050db5ef55c6d3fcc4858bd9b5746e691499e72fc392d58ec70
136 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to other PDF files hosted on unrelated domains. The heuristic 'PDF_SEO_LINK_FARM' indicates this is likely a link farm designed to manipulate search engine results or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the sheer volume of suspicious URLs suggests a coordinated effort to redirect users to potentially harmful content.

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://nobodyknows.blog/uploads/1/3/1/3/131398596/131398596.html#estructura+del+texto+literario+yahoo
    • http://dirtytshirts.net/uploads/1/3/1/0/131070393/70a8f.pdf
    • http://thehandmadebearcompany.com/uploads/1/3/1/1/131163631/pusunilok.pdf
    • http://fireflygraphics.us/uploads/1/3/0/6/130621313/pusewikunip.pdf
    • http://draecreations.com/uploads/1/3/0/5/130543588/177463aa39b1921.pdf
    • http://rpmautocare.net/uploads/1/3/1/0/131070523/tofovogatex_tulet_xapuga_pupigobin.pdf
    • http://smjestaj.delorita.com/uploads/1/3/0/2/130289523/3085741.pdf
    • http://mamaintheraw.com/uploads/1/3/0/6/130621979/kajozogazudifeluj.pdf
    • http://alyssagarberwrites.com/uploads/1/3/1/3/131378780/nuvimokivoretamawat.pdf
    • http://uncledickshardcider.com/uploads/1/3/0/7/130738994/zadoxujisevi.pdf
    • http://heritageportfoliotransactions.com/uploads/1/3/0/8/130814076/b52e8d7c600.pdf
    • http://luxuryfauxfloral.com/uploads/1/3/0/5/130551187/vumumo.pdf
    • http://noelsbaklava.com/uploads/1/3/0/8/130873975/rebibutomuzuz.pdf
    • http://killianscholar.org/uploads/1/3/1/3/131384797/21fc9cd949bd9d4.pdf
    • http://herindigo.shop/uploads/1/3/1/3/131381839/pesifugido_zokogeku_fomugogofuv.pdf
    • http://hbrcinvermont.net/uploads/1/3/0/8/130814716/luwowiru-gexorurokevo.pdf
    • http://sylvasilver.com/uploads/1/3/0/6/130639236/4b7fd8b.pdf
    • http://insuranceandretirementsolutions.net/uploads/1/3/0/6/130603721/4273078.pdf
    • http://mkingman.com/uploads/1/3/0/9/130969322/kobijukizovaf_xulovuvaxedogeb_sugirowi.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_off00007022.bin
af0d13d037fe3ca2e817db8744765193e0f86f37b95c19d86e0b0bab2a49b170		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7022 8708 bytes

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