Malicious PDF — malware analysis report

Static analysis result for SHA-256 67a9fadb9c3b5d53…

MALICIOUS

PDF

44.4 KB Created: 2020-03-25 03:53:02 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2eedeceae16ccf40d1e91e948347c2fd SHA-1: e88900322d796445dc4990d61646ace1d25e07a9 SHA-256: 67a9fadb9c3b5d53c416ad1c49bbf8fd59a3166f319eccda1f6e2470422d4fc4
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to other PDF files on different domains. This suggests a link farm or SEO manipulation tactic, likely intended to host malicious content or redirect users to phishing sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious link structure.

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://mryockey.com/uploads/1/3/0/5/130546497/130546497.html#multiplicacion+de+bases+iguales+y+exponentes+diferentes
    • http://mychangingthenarrative.com/uploads/1/3/0/6/130620923/fotozebawol_natamozaxuzu_jimefu_kefinapujode.pdf
    • http://itsetutkimus.com/uploads/1/3/0/6/130603710/jixumebenakoxu.pdf
    • http://oliecoachgeraldine.com/uploads/1/3/0/4/130488229/xanosubujalosisinawu.pdf
    • http://lunaumbrawinery.com/uploads/1/3/0/7/130776525/lojagovuj.pdf
    • http://hoskinmetrologie.com/uploads/1/3/0/3/130379113/zikok.pdf
    • http://host69.carmichaelnl.com/uploads/1/3/0/7/130740210/836806.pdf
    • http://www.blissfullyyoursbybridget.com/uploads/1/3/0/6/130603710/boxason.pdf
    • http://metallicblackrecords.com/uploads/1/3/0/6/130640081/viradafaga.pdf
    • http://windowrestorationmichigan.com/uploads/1/3/0/6/130605078/kupurevetine_kovareda_rujefizexuva_taruzafo.pdf
    • http://www.smaxmusic.com/uploads/1/3/0/9/130969954/miwuduno-rimowigav-nixij.pdf
    • http://mobileboutiqueadriannemerkling.com/uploads/1/3/0/3/130313363/suzofudafaponum.pdf
    • http://leajoaccessories.com/uploads/1/3/0/2/130288571/0efb2d6553.pdf
    • http://roombaga.com/uploads/1/3/0/6/130639126/tifimenufegemo.pdf
    • http://manukaucityphysio.com/uploads/1/3/0/2/130289792/fopofut_xazitixedo_jowedesize_vafekivupu.pdf
    • http://whereismyeraser.com/uploads/1/3/0/6/130620511/dugudo.pdf
    • http://shelleyrichardson.net/uploads/1/3/0/5/130545573/jodelijitalul.pdf
    • http://store.weissent.com/uploads/1/3/0/5/130543099/tofuninamatulisosoz.pdf
    • http://www.gezinsdynamiek.eu/uploads/1/3/0/5/130588943/8287723.pdf
    • http://hostmaster.fionasremedialmassage.com/uploads/1/3/0/7/130738528/litaz.pdf
    • http://greaterthanbook.com/uploads/1/3/0/5/130545698/0cab96ad3.pdf
    • http://expresswash.net/uploads/1/3/0/4/130489465/dutuzut.pdf
    • http://teamsherpa.org/uploads/1/3/0/3/130379226/5e6a5f66f898.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_off0000838d.bin
ddde5899a2211eff71d96bfe311a3b8465215c1e4eb693f4e123c1f8bfd138ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x838D 8776 bytes

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