Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b78e32e9c23dfbd…

MALICIOUS

PDF

39.4 KB Created: 2020-03-14 11:03:41 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 4df89a1fc908a3a713e5a123775726ae SHA-1: fde9b35739f032ac43ebc9bfc864ac000fb9e991 SHA-256: 0b78e32e9c23dfbd6c6ac5e7c783859dafb45ae3ccce0ba1b01dd1b3bc961f04
136 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or SEO poisoning attempt. The ML classifier strongly flagged this PDF as malicious. The embedded document body text, though partially corrupted, contains a URL that is also present in the list of external links, suggesting a coordinated effort to redirect users.

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://74-123-79-11.mgwnet.com/uploads/1/3/0/2/130270951/130270951.html#boost+juice+nutrition+guide
    • http://richardforiberiaparishpresident.com/uploads/1/3/0/2/130273733/7963786.pdf
    • http://uniteachingeportfolio.com/uploads/1/3/0/6/130639508/8201815.pdf
    • http://peopleandpipelines.com/uploads/1/3/0/5/130544078/loluvogogawoj.pdf
    • http://autodiscover.wintermoonsummersun.com/uploads/1/3/0/7/130775786/715357.pdf
    • http://stokingitforward.com/uploads/1/3/0/5/130590305/1714978.pdf
    • http://msjacques-purdysclassroom.com/uploads/1/3/0/6/130639885/1456473.pdf
    • http://usastarterkit.com/uploads/1/3/0/8/130813800/xovor.pdf
    • http://mail.bodiesbybreezy.com/uploads/1/3/0/4/130478203/27e8cda3ea996.pdf
    • http://74-123-72-200.mgwnet.com/uploads/1/3/0/7/130775676/50cb8b97.pdf
    • http://firewallyourwallet.com/uploads/1/3/0/6/130604150/lagetetiriniken_jelevofu_wuxipexufola_robitomad.pdf
    • http://sarahpoulgrain.com/uploads/1/3/0/8/130813111/f8cbec45cdb7e.pdf
    • http://www.culver3v3invitational.com/uploads/1/3/0/8/130814132/zivonalirifipoje.pdf
    • http://detailking-turek.pl/uploads/1/3/0/9/130969441/poxilirevuze-gomovipisurebi-xofizela.pdf
    • http://pearlstreetconsulting.com/uploads/1/3/0/8/130813694/kejodixurir.pdf
    • http://drodphotography.net/uploads/1/3/0/7/130739143/xemogapasubovar.pdf
    • http://gelinkalbigelinlik.com/uploads/1/3/0/8/130814192/fcdae0ff56e.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_off00006dfe.bin
83f9cc4937242bd07794af1938426836c2fe649cec3b42f763a0a612311e0423		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DFE 9160 bytes

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