Malicious PDF — malware analysis report

Static analysis result for SHA-256 343c876277065bda…

MALICIOUS

PDF

46.1 KB Created: 2020-03-23 16:48:13 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cf9a4255b395d954efcb42d7a146e9a3 SHA-1: 2fd1dd4a34e6b715263db1563a421c71784f2cf5 SHA-256: 343c876277065bdaa28f08cf47fad588bd4736403d648a74c4600a368afcecf1
136 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many of which point to other PDF files with numeric slugs, indicating a potential link farm or SEO manipulation scheme. The document body, though partially corrupted, contains a URL that mirrors one of the heuristic findings, suggesting a coordinated effort to direct users to external resources. The ML classifier strongly flagged this PDF as malicious.

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://hplministries.org/uploads/1/3/0/7/130739223/130739223.html#como+se+representa+en+lenguaje+algebraico+la+semisuma+de+dos+numeros+cualesquiera
    • http://www.mrsloanescience.com/uploads/1/3/0/7/130776656/pelomimexizovovor.pdf
    • http://alicevictoriadesign.com/uploads/1/3/0/3/130379115/bamisa.pdf
    • http://vhhealthcarefun.com/uploads/1/3/0/6/130604620/6314629.pdf
    • http://theflimsyreed.com/uploads/1/3/0/7/130738652/6478081.pdf
    • http://thenestfamilyresource.com/uploads/1/3/0/7/130776269/zabil.pdf
    • http://britecsolutionsinc.com/uploads/1/3/0/4/130489229/sozidudoj-masugokowifuwub-gisoripij.pdf
    • http://shsmerchant.com/uploads/1/3/0/5/130550903/fawuze-sopotewapenazi-fujezoxabujoxoj-dodigulezodid.pdf
    • http://www.tropicdry.com/uploads/1/3/0/6/130604425/zokusomomebep-fugodola.pdf
    • http://friendsofthejohnsonnaturecenter.org/uploads/1/3/0/6/130604757/b980adb7e4.pdf
    • http://protonpublishing.com/uploads/1/3/0/5/130548152/kazafizizod.pdf
    • http://www.openformatdjs.net/uploads/1/3/1/1/131164488/giwijoturidege.pdf
    • http://mail.newparkgames.com/uploads/1/3/0/7/130775782/3737330.pdf
    • http://gotclubs.org/uploads/1/3/0/5/130551356/runetagajubete.pdf
    • http://weinspirewellness.com/uploads/1/3/0/6/130639643/7b64b5.pdf
    • http://northwestoksurvivalswim.com/uploads/1/3/0/5/130588731/nonejifufubotiw.pdf
    • http://spreadpool.org/uploads/1/3/0/2/130288644/lofuwim.pdf
    • http://friendsandbrothers.net/uploads/1/3/0/4/130483667/mafebavifalobav.pdf
    • http://server.litquake.org/uploads/1/3/0/8/130814129/jumut-jetemalu.pdf
    • http://kandodindo.com/uploads/1/3/0/9/130969664/xilubixiz_gutubopedar_xisalos.pdf
    • http://brightgirlbook.com/uploads/1/3/0/7/130776174/besote-lizunuzapudekes-parul.pdf
    • http://synchroski.org/uploads/1/3/0/6/130621052/tefitabe-povupipusowudi-jifubizaza-lamapilawevofo.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_off00008566.bin
8422ca2152d41c805616998f187d4a9c4d1c2fdce95281c94e7758b91e35d64c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8566 9444 bytes

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