Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c6f4baf086e16fb…

MALICIOUS

PDF

52.6 KB Created: 2020-03-25 08:41:03 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-08-25
MD5: ffae494ede610161c6c2758f6ae387df SHA-1: 0609d75652d686ab0efd58250f3a566ea60ceac2 SHA-256: 7c6f4baf086e16fbb5cc98fa32e785e0ccf38e490647efb03e8a0da144fa9470
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 PDFs hosted on various domains, a technique often used for SEO spam or to distribute malicious content. The ML classifier strongly indicated maliciousness, and the PDF_RANDOM_URL_LINK heuristic identified a link to an algorithmically generated URL. The document body, though heavily obfuscated, contains references to the URLs, suggesting an intent to redirect the user to these external resources.

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://christinawaggonerfineart.com/uploads/1/3/0/4/130476327/130476327.html#caracteristicas+de+la+alta+edad+media+resumen PDF link annotation
    • http://www.penelements.com/uploads/1/3/0/9/130969364/e8e8b0dd1.pdfIn PDF document text
    • http://bluepointassetmanagement.com/uploads/1/3/0/5/130589054/wavetuxarelanu.pdfIn PDF document text
    • http://www.curatedbychrista.com/uploads/1/3/0/5/130539458/bopujaxogu.pdfIn PDF document text
    • http://skidayz.co/uploads/1/3/0/4/130488248/263d7.pdfIn PDF document text
    • http://mail.concordrydesailing.org.au/uploads/1/3/0/8/130874347/lifeva_movamodidib_fofajur_tezalopalab.pdfIn PDF document text
    • http://trustedfinancialpro.com/uploads/1/3/0/2/130289254/soxezukobe_pilufenu.pdfIn PDF document text
    • http://iowaadventureoutfitters.com/uploads/1/3/0/5/130541744/9032627.pdfIn PDF document text
    • http://www.ttcasfriendsandfamily.org/uploads/1/3/0/6/130639854/ebad84.pdfIn PDF document text
    • http://washingtonfurnituresales.com/uploads/1/3/0/6/130604644/wudajeposoko_mabedalekasi.pdfIn PDF document text
    • http://newhorizonsllchardwoodscustomprofiles.com/uploads/1/3/0/4/130483940/xitujomikezus.pdfIn PDF document text
    • http://andersonrubio.com/uploads/1/3/0/6/130604240/zegiz.pdfIn PDF document text
    • http://markjawad.com/uploads/1/3/0/5/130588502/pawipa-bawesizepe-gikiban.pdfIn PDF document text
    • http://blakemoney.com/uploads/1/3/0/7/130738548/jozel_tunobozenivatuw.pdfIn PDF document text
    • http://mylifesreflections.com/uploads/1/3/0/7/130776102/3beb9f78f45d81.pdfIn PDF document text
    • http://amjav.com/uploads/1/3/0/8/130814121/8efa0069dd.pdfIn PDF document text
    • http://premieraccountinsurance.com/uploads/1/3/0/4/130488251/ce832cac1997f.pdfIn PDF document text
    • http://www.hey-loretta.com/uploads/1/3/0/5/130588827/kupozat.pdfIn PDF document text
    • http://amatidolci.com/uploads/1/3/0/5/130550805/90da4fdf93d.pdfIn PDF document text
    • http://www.noraleefashion.com/uploads/1/3/0/6/130604417/webupor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8487 8820 bytes
SHA-256: 99d7bf03cbc72566d56e9b74ade1415b7d53b60915123d998653b64f168ca1ed
font_01_sfnt_off0000a447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA447 2652 bytes
SHA-256: e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc
font_02_sfnt_off0000adae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADAE 16036 bytes
SHA-256: 779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63

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