Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaa74bb4b3147e48…

MALICIOUS

PDF

41.8 KB Created: 2020-03-07 14:24:02 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 4be4403eab72b8783e8f2b341546f57f SHA-1: 8769249789b47819989523d21f68af215c34348c SHA-256: aaa74bb4b3147e486ae3e55a0b24f9e747e91fd2e7327970a4c571138c9594fd
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or SEO manipulation tactic. The document body contains garbled text related to 'Brachial plexus injuries types' and the authoring application 'wkhtmltopdf', which is likely a lure or obfuscation. The primary attack pattern involves directing users to a multitude of external resources.

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://shopbelfast.info/uploads/1/3/0/4/130436272/130436272.html#brachial+plexus+injuries+types PDF link annotation
    • http://chloepictures.com/uploads/1/3/0/4/130488946/tewafaxedilo_sowezuzirogamup.pdfIn PDF document text
    • http://momentumwomenscenter.com/uploads/1/3/0/6/130620265/5232576.pdfIn PDF document text
    • http://unionwelder.com/uploads/1/3/0/5/130590279/lezuxuxafomoj_guxepepaxepol_gusibuxegulo.pdfIn PDF document text
    • http://speakenglishnaturally.me/uploads/1/3/0/5/130550956/zibubimefiposudud.pdfIn PDF document text
    • http://www.kasiawolyn.com/uploads/1/3/0/2/130289792/d9aa70.pdfIn PDF document text
    • http://nateveorganic.com/uploads/1/3/0/2/130287538/jupumegojikabitedate.pdfIn PDF document text
    • http://milissweetstogo.com/uploads/1/3/0/8/130814234/2322252.pdfIn PDF document text
    • http://noraleefashion.com/uploads/1/3/0/7/130740598/puxodoniz.pdfIn PDF document text
    • http://tonypandytaxiservices.com/uploads/1/3/0/6/130604295/bapifedewuwelum.pdfIn PDF document text
    • http://ceasefireretreat.org/uploads/1/3/0/4/130476594/fefudibotesuniw_tasoma_wejizewubi.pdfIn PDF document text
    • http://ardsleylatin.org/uploads/1/3/0/5/130551053/vifemib.pdfIn PDF document text
    • http://wbagi.com/uploads/1/3/0/7/130775551/5392651.pdfIn PDF document text
    • http://mikeandthebigscary.com/uploads/1/3/0/7/130775797/suxulakapuxikapu.pdfIn PDF document text
    • http://theartofiray.com/uploads/1/3/0/3/130323762/gozarexo.pdfIn PDF document text
    • http://inshopper.site/uploads/1/3/0/6/130604231/sokutuvi.pdfIn PDF document text
    • http://caylahwestphotography.com/uploads/1/3/0/7/130775256/4278558.pdfIn PDF document text
    • http://soscharityservices.com/uploads/1/3/0/5/130590435/3526282.pdfIn PDF document text
    • http://ashleighvaillancourt-winebrenner.com/uploads/1/3/0/5/130588346/6186224.pdfIn PDF document text
    • http://emmawatkinson.co.uk/uploads/1/3/0/2/130287424/38743.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CFC 7424 bytes
SHA-256: 3d9a92c3a4e7b6f0210bfbffa172917d4456230cb81f0b425334378e5d54279e

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