Malicious PDF — malware analysis report

Static analysis result for SHA-256 761fc906dd3097bd…

MALICIOUS

PDF

36.2 KB Created: 2020-03-28 14:15:15 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 6955ba52b65089cb7337cc08c9330818 SHA-1: 4c7d2f51bf75c862230b66d418de8862d92e0b0c SHA-256: 761fc906dd3097bde2c0548f984acec9e5307e75e0e8a3275f08f21cfbe3a815
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are disguised as driver downloads. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic suggests this is part of a link farm designed to distribute malicious content or phish users. The embedded URLs are likely used to redirect victims to malicious sites.

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://popjetfountain.com/uploads/1/3/0/4/130488547/130488547.html#dell+inspiron+n7110+wireless+driver+64+bit
    • http://webmail.itinfocom.in/uploads/1/3/0/5/130539205/0e248902970.pdf
    • http://2018vote.us/uploads/1/3/0/8/130814774/lepifufemojerefif.pdf
    • http://www.sanctuize.com/uploads/1/3/0/9/130969917/rakepab_jutaxa.pdf
    • http://westsidedesberkeley.com/uploads/1/3/0/9/130970014/lipazavamazogo-jowedeluwab.pdf
    • http://www.ubmstone.com/uploads/1/3/0/6/130622048/41450.pdf
    • http://themagictophat.com/uploads/1/3/0/3/130313429/bf621b4bf79d1.pdf
    • http://paintingclassesmiami.com/uploads/1/3/0/2/130270980/powiko.pdf
    • http://boulderboardroom.com/uploads/1/3/0/8/130874262/297178eda40724.pdf
    • http://www.apurima-ltd.com/uploads/1/3/0/5/130551464/64d1acb1d3.pdf
    • http://opslocity.com/uploads/1/3/0/4/130435556/wopitiref_nujuwolameguwi_jafobevuwoz.pdf
    • http://studentafe.com/uploads/1/3/0/5/130588931/6725170.pdf
    • http://eagleeyedronevideophotography.com/uploads/1/3/0/2/130288682/8006823.pdf
    • http://caseybradleyarts.com/uploads/1/3/0/6/130621495/demawilezidi_jutetip_talolap.pdf
    • http://studioprintatelier.com/uploads/1/3/0/2/130288757/zizif.pdf
    • http://botoxformenatlanta.com/uploads/1/3/0/7/130738596/563778.pdf
    • http://realwebstack.com/uploads/1/3/0/7/130739648/temezuvuludav_vepowero_mipup.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_off000062d0.bin
7f1f02abb76ddd98c20f917a9657c67b1d431847aa24e3e3d8f491a4075230da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62D0 7980 bytes

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