Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc9740f981ad0b24…

MALICIOUS

PDF

47.3 KB Created: 2020-03-09 00:50:32 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e09e9fb8700b05c8dff7b0d79517b01f SHA-1: 3599cfcc09c53fe8152c8594288555a4a3639dad SHA-256: dc9740f981ad0b24b2ce5e8480bbbc61a058f0f9ce234ea13de41906c9ff20a2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains several URLs that are likely part of a link farm or redirection scheme. The primary purpose appears to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://laurence-blum.com/uploads/1/3/0/7/130740133/130740133.html#il+forward+rate+agreement+%28fra%29+%C3%A8+un+contratto+quiz
    • http://discovercaddogap.com/uploads/1/3/0/3/130379517/lemudubapejuxod_nusepavanazened_vedit.pdf
    • http://absolutereductions.org/uploads/1/3/0/4/130476229/nenexamojefojolaw.pdf
    • http://em636jpf2019.com/uploads/1/3/0/9/130969186/loripufuvet_voxopugomos_zagufotokazaw.pdf
    • http://sickbeetsmerch.com/uploads/1/3/0/4/130483629/nidater_sukiwevujas_tisexasisilun_kimesawadixev.pdf
    • http://mylegalwebservices.com/uploads/1/3/0/4/130483804/kazukirotexujisado.pdf
    • http://lockyerfirstaid.net/uploads/1/3/0/9/130969644/voler.pdf
    • http://nefinancialservicesllc.com/uploads/1/3/0/5/130590368/37815924.pdf
    • http://schneiderdownssecurity.com/uploads/1/3/0/7/130775503/31c55.pdf
    • http://www.jbraintiedyes.com/uploads/1/3/0/7/130775633/86ae29932c5.pdf
    • http://www.creativefercrosstechnology.com/uploads/1/3/0/4/130476317/1157160.pdf
    • http://partnersinrelief.com/uploads/1/3/0/7/130775951/8268997.pdf
    • http://www.mncheese.org/uploads/1/3/0/6/130621663/9653485.pdf
    • http://www.moorejude.com/uploads/1/3/0/8/130813786/bd3cbd.pdf
    • http://theinterior.org/uploads/1/3/0/4/130475881/1484666.pdf
    • http://arclearningonline.com/uploads/1/3/0/8/130874156/pixevewamuxigax-busumawigig-ragukepefak-pakoxisu.pdf
    • http://sanjaykedia.com/uploads/1/3/0/6/130603824/0e94f8c6.pdf
    • http://angelguerrero.net/uploads/1/3/0/6/130620343/3753904.pdf
    • http://mrappa.com/uploads/1/3/0/4/130476766/komutafixow.pdf
    • http://motta-ddd.pl/uploads/1/3/0/2/130270924/4d90101de7.pdf
    • http://newbeginningsinvestorsllc.com/uploads/1/3/0/3/130379311/zuvije_mumigovakenamap_tafitin.pdf
    • http://petsdr.net/uploads/1/3/0/4/130490117/rovusa.pdf
    • http://riseuproadtrip.com/uploads/1/3/0/7/130739032/fonal.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007cae.bin
1957428794578a072b8983e864e5701b52391162abfb2d6d14c6295fa8a16687		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CAE 6444 bytes
font_01_sfnt_off00008c70.bin
1203c739fe2f3bf6c352941c8955fd21f2d20339fccc88c51248498c560d9447		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C70 8664 bytes

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