Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c3600da0fc6eea9…

MALICIOUS

PDF

40.6 KB Created: 2020-03-08 09:14:08 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fda5fd78e1d8623b39afe0edd662b643 SHA-1: c4c2eec62f80dac23ce9a23f5e3873e958cce3b3 SHA-256: 7c3600da0fc6eea9e73ae665ae0d599b44b7456cd1f9fbad8cafa63ca6464cec
94 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. No scripts were extracted from this sample, limiting the ability to determine the exact payload or further actions. The primary attack pattern observed is the mass linking to external domains.

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://www.geobiologiabarcelona.es/uploads/1/3/0/3/130313098/130313098.html#lactational+amenorrhea+method+of+family+planning
    • http://beautyenpointe.com/uploads/1/3/0/2/130289345/bijalo_kipixeni_bopirox.pdf
    • http://digital-human.org/uploads/1/3/0/5/130588550/dumemibawofozovimuwa.pdf
    • http://itsmrjack.com/uploads/1/3/0/5/130550828/7583195.pdf
    • http://broomtowncafe.com/uploads/1/3/0/9/130969146/7502dcf.pdf
    • http://plannedunparenthood.net/uploads/1/3/0/7/130775719/1218166.pdf
    • http://www.acaccentsjewelry.com/uploads/1/3/0/3/130323603/gogasejifa.pdf
    • http://www.homepostpartum.com/uploads/1/3/0/7/130776423/jixazexovikokasux.pdf
    • http://kellyannscraftcorner.com/uploads/1/3/0/5/130540155/vamupokixazaf.pdf
    • http://languageoftheself.com/uploads/1/3/0/5/130550711/kasafaso_xibed.pdf
    • http://indivisiblesandiegocounty.com/uploads/1/3/0/6/130621691/5f39b16b1.pdf
    • http://life-in-full-empowerment.net/uploads/1/3/0/7/130740117/43e098015b662.pdf
    • http://monogramsbyjada.com/uploads/1/3/0/6/130620224/f92374daeff.pdf
    • http://vvsphoto.com/uploads/1/3/0/7/130739598/d752d1187.pdf
    • http://boredumb.com/uploads/1/3/0/7/130740618/kizofexavibij.pdf
    • http://mail.pariseastside.com/uploads/1/3/0/8/130813888/7506628.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_off00007424.bin
5c7154da51006c58d4498d311cd1218ee39a858e9f4da28531841cb5e8c0f2f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7424 8884 bytes

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