Malicious PDF — malware analysis report

Static analysis result for SHA-256 0537d0d0e82c319d…

MALICIOUS

PDF

52.7 KB Created: 2020-03-10 14:44:17 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: be2e3e2cf3a4ceed93dc34f03dbc93fe SHA-1: 49f44b229c47d7553ce1610fc1b3c9358bd1da40 SHA-256: 0537d0d0e82c319d27ef3998dfa878e634584f04e50872c75561048465211a11
136 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files hosted on unrelated domains. This pattern is indicative of a link farm or SEO manipulation tactic, potentially used to distribute malicious content or improve search engine rankings for malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious nature of the numerous external links.

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://bladebooking.ca/uploads/1/3/0/5/130543640/130543640.html#big+five+personality+test+vs+myers+briggs
    • http://www.livelargeonlittle.com/uploads/1/3/0/8/130873830/gexagejusapim_rapavavupu.pdf
    • http://artizaninternational.co.uk/uploads/1/3/0/8/130814960/9972938.pdf
    • http://www.blindfaith-book.com/uploads/1/3/0/6/130640197/97ba1.pdf
    • http://highlysensitivecreative.com/uploads/1/3/0/7/130776738/d561b.pdf
    • http://stthomastheapostleparishmontfortwi.com/uploads/1/3/0/4/130435925/8978421.pdf
    • http://abrolhoslandscaping.com.au/uploads/1/3/0/6/130621290/7d97abe33b9c908.pdf
    • http://mail.endofnovelty.com/uploads/1/3/0/8/130873735/rogodofodepizi-zumojizemod.pdf
    • http://rafflescollegelibrary.com/uploads/1/3/0/6/130639397/daxokubil.pdf
    • http://www.bagwomenss.com/uploads/1/3/0/6/130620979/baxiturunato_xokudafirirez_wesevikawodiji_vaxinopeforida.pdf
    • http://littlefristonlodge.com/uploads/1/3/0/5/130589191/gakuvitez-begigafavid.pdf
    • http://www.reddaggerairsoft.com/uploads/1/3/0/7/130738680/75642.pdf
    • http://vinculumartfinance.com/uploads/1/3/0/5/130539238/8588659.pdf
    • http://robemnybautistaphotography.com/uploads/1/3/0/7/130740015/xijagepid-fosevinul.pdf
    • http://www.group15project.com/uploads/1/3/0/7/130776605/luxuvezajid.pdf
    • http://maplehousingbmt.com/uploads/1/3/0/7/130775731/gukojewozebomigaju.pdf
    • http://www.camryncs.com/uploads/1/3/0/5/130550724/lepilapoxubokixedapo.pdf
    • http://www.mellowspaparties.com/uploads/1/3/0/6/130620251/0f1417c7c8.pdf
    • http://neverdonefiberfarms.com/uploads/1/3/0/3/130323674/guvag_kotixarul_memesigijorak_gemonetavigutu.pdf
    • http://ms2-tech.com/uploads/1/3/0/6/130604563/3d53e32c1ca2d27.pdf
    • http://tamsformers.org/uploads/1/3/0/5/130551635/4899004.pdf
    • http://dthmd.com/uploads/1/3/0/9/130969576/9487415.pdf
    • http://mx.vivantehoa.com/uploads/1/3/0/2/130287988/zarut.pdf
    • http://www.answer-design.net/uploads/1/3/0/4/130476273/09cdef8420.pdf
    • http://www.canadianextra.ca/uploads/1/3/0/6/130620501/58b1d.pdf
    • http://tasmaniadisabilitylobby.com.au/uploads/1/3/0/5/130543054/807f3324a638e9.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_off0000a422.bin
620a6c5649f23c41b8fd6059a14b672b9cbe5c7484166bbfc9e471461c714eb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA422 8368 bytes

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