Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b83e77a38d52384…

MALICIOUS

PDF

39.6 KB Created: 2020-05-13 02:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cb007f77abc02372b4f843abf49bb90e SHA-1: ebcd4f1fbd0bad3f0b0ccdd0e8f1c50aab5bf52b SHA-256: 5b83e77a38d52384d69026bdd6b9df98e3e9bb8f267b0cd22fed7205dc7f35ae
136 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, containing a mass of external links to other PDF files, likely for SEO manipulation or to host further malicious content. The ML classifier strongly indicated maliciousness, and the presence of numerous algorithmically generated URLs supports this assessment. No scripts were extracted, but the structure suggests a potential initial access vector via spearphishing attachment.

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://saratogaad.com/uploads/1/3/0/8/130814076/130814076.html#colosseum+rome+guided+audio+tour
    • http://hihgfive.com/uploads/1/3/0/6/130621706/5588118.pdf
    • http://myflowers2015.com/uploads/1/3/0/7/130776304/pufepanugup.pdf
    • http://therightdoor.com/uploads/1/3/1/3/131378972/zuvarusatevulodis.pdf
    • http://thebigbearexperience.com/uploads/1/3/1/4/131453733/xepokefive_xitadifofo_notam_juxujerovepeme.pdf
    • http://vegangiftbox.org/uploads/1/3/0/5/130589429/3784232.pdf
    • http://crossingbridgeslifecoaching.com/uploads/1/3/0/7/130739927/wegedototukokidowa.pdf
    • http://generationvending.com/uploads/1/3/0/9/130969090/5375512.pdf
    • http://cocovonbonbon.com/uploads/1/3/0/3/130323186/movefow.pdf
    • http://dlbflute.com/uploads/1/3/0/5/130550895/luzesuw.pdf
    • http://snssalon.in/uploads/1/3/0/9/130969971/xaraviravumofod.pdf
    • http://biomaxresearch.net/uploads/1/3/0/7/130739766/xajofekenawuvutuveme.pdf
    • http://stopgappropertymanagement.com/uploads/1/3/0/6/130604645/5972300.pdf
    • http://kapispub.com/uploads/1/3/1/6/131606133/lusutamowot-jesutoburotulub.pdf
    • http://richmondlockandkeystatenisland.com/uploads/1/3/1/4/131407958/7757591.pdf
    • http://ruokatakomo.com/uploads/1/3/0/2/130289553/55bc15025c.pdf
    • http://blockchainbusinesstrip.org/uploads/1/3/0/7/130775129/47f93d304a8b6a.pdf
    • http://arkrivercoalition.com/uploads/1/3/0/3/130379298/cc05ef8f.pdf
    • http://us-sog.net/uploads/1/3/0/7/130738628/genup_relotugosol_jimupemuwisidi_tokati.pdf
    • http://krdrecruitment.com/uploads/1/3/1/4/131438741/jonawuzarofinaze.pdf
    • http://simplyhappysolutions.com/uploads/1/3/1/4/131406435/33fb0bf4292f9.pdf
    • http://edensdelightllc.com/uploads/1/3/0/6/130621781/bejasetujilu-lazadurakisiwa-fexaxedovowum.pdf
    • http://clixkay.com/uploads/1/3/1/6/131606150/5831418.pdf
    • http://remoteesl.com/uploads/1/3/0/2/130270845/vidego.pdf
    • http://boomersbakery.com/uploads/1/3/1/4/131454304/sukezowaxivatoneje.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f80.bin
d175a221298f30313eb206f30840da3911900a15ff2de7a1da4003d39b9abb48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F80 10096 bytes

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