Malicious PDF — malware analysis report

Static analysis result for SHA-256 84d5c0b757c1a290…

MALICIOUS

PDF

30.2 KB Created: 2020-06-12 04:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-10
MD5: 87c798f3afd4da5f0cca92b673c95a79 SHA-1: b82babbab4738ce5e02203e6b49b07e87490861f SHA-256: 84d5c0b757c1a290e37ee27c7138ebf57bd725fc4193619f968a2d9e00daadba
136 Risk Score

Malware Insights

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

The PDF contains a large number of algorithmically generated URLs, many of which point to other PDFs, suggesting a link farm designed to host malicious content. The document body text, though garbled, includes a reference to a "Fantastic vent owners manual" and several URLs, indicating a lure to download further malicious files. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://thedevischool.org/uploads/1/3/1/1/131164257/131164257.html#fantastic+vent+owners+manual PDF link annotation
    • http://wakeanddaybreak.com/uploads/1/3/0/6/130620168/lobileguboresijazo.pdfIn PDF document text
    • http://torringtoneducatorsassociation.com/uploads/1/3/0/6/130604952/72a54a0f0c34.pdfIn PDF document text
    • http://eastbournewindowcleaning.com/uploads/1/3/0/6/130621847/wedoge.pdfIn PDF document text
    • http://chrisfulmerwrites.com/uploads/1/3/0/7/130775920/8381dd393a2.pdfIn PDF document text
    • http://towersandturretgames.com/uploads/1/3/0/7/130738975/gokumiwozubifa-tekazub-walijogu.pdfIn PDF document text
    • http://kabukilashes.ca/uploads/1/3/1/4/131438389/350a9638.pdfIn PDF document text
    • http://sweetvcakes.com/uploads/1/3/0/5/130539341/3732798.pdfIn PDF document text
    • http://neptunelandscapingservice.com/uploads/1/3/0/5/130551472/tenegavu_rasamezepinop_fusozimikizima_tusofomofeperu.pdfIn PDF document text
    • http://thelittlemediacompany.co.uk/uploads/1/3/0/8/130874569/1880726.pdfIn PDF document text
    • http://support.rmahf.org/uploads/1/3/0/2/130289272/savogex.pdfIn PDF document text
    • http://satsofedmonton.org/uploads/1/3/0/9/130969833/5352365.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://suzofosal.files.wordpress.com/2020/06/50313321358.pdfIn PDF document text
    • https://tetetufaba.files.wordpress.com/2020/06/31381593730.pdfIn PDF document text
    • https://subujitupus.files.wordpress.com/2020/06/13430622767.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 3

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4DC5 9328 bytes
SHA-256: 1dd7e6964e67c52ecebb159d0c778c2bbd28d9d14fee0738ce2dce29dc14e017

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