Malicious PDF — malware analysis report

Static analysis result for SHA-256 920a66a24e021bcb…

MALICIOUS

PDF

39.4 KB Created: 2020-03-31 19:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: e5dfcb0d45743a86caee2cc67b1aed07 SHA-1: 21e18a6cd0c869317a9315769e1e336627ad7090 SHA-256: 920a66a24e021bcb68b550d9b08b1af53abb0fcdadcbbbac3af1547542a3063b
144 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.002 Spearphishing Attachment

The PDF document contains numerous external links, many of which point to PDF files hosted on various domains, suggesting a link farm or SEO poisoning tactic. The document body explicitly mentions downloading 'nitro pdf editor full version free', and a heuristic indicates a 'Password-protected archive handoff' lure. This suggests the document is designed to trick users into downloading a fake software installer, potentially leading to malware infection. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://capefearforge.com/uploads/1/3/0/6/130604911/130604911.html#download+nitro+pdf+editor+full+version+free PDF link annotation
    • http://motortrainingtotaal.com/uploads/1/3/0/7/130776219/2d89564ea.pdfIn PDF document text
    • http://katesamano.com/uploads/1/3/0/9/130969423/posoxowugotof.pdfIn PDF document text
    • http://martayogahome.com/uploads/1/3/0/5/130551001/mewidaguliloloro.pdfIn PDF document text
    • http://bigboatshow.com/uploads/1/3/0/4/130478123/9684896.pdfIn PDF document text
    • http://breathehealthyhome.com/uploads/1/3/0/7/130776043/568c71b8ac.pdfIn PDF document text
    • http://scotlandquilttours.com/uploads/1/3/0/7/130776016/6889628.pdfIn PDF document text
    • http://demarproperty.com/uploads/1/3/0/4/130483626/79ec892fd3c.pdfIn PDF document text
    • http://guidancemap.com/uploads/1/3/0/7/130739105/rapusizebiburoxinu.pdfIn PDF document text
    • http://leonartdesign.com/uploads/1/3/0/3/130379741/jikul.pdfIn PDF document text
    • http://freyby4.com/uploads/1/3/0/6/130639500/lulobit_jevixawoxelu_basojowu_nimodatikopiber.pdfIn PDF document text
    • http://sunharvestgarden.com/uploads/1/3/0/6/130620769/bonefobaza-busisopilap-xitedeguto-xazeboxa.pdfIn PDF document text
    • http://kidscook4acause.org/uploads/1/3/1/1/131163690/3595254.pdfIn PDF document text
    • http://coisich.com/uploads/1/3/0/6/130604860/2198625.pdfIn PDF document text
    • http://savingsarapph.com/uploads/1/3/1/3/131379698/jixubirokujizid-dojafun-dajowobodo.pdfIn PDF document text
    • http://ceossreyes.com/uploads/1/3/0/2/130289792/9a58639b.pdfIn PDF document text
    • http://westchesterbakery.com/uploads/1/3/0/2/130272396/1852600.pdfIn PDF document text
    • http://phoenix-academy.org/uploads/1/3/0/4/130483507/riduxete.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 4

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_off00006e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E96 8188 bytes
SHA-256: 319ef1d44cc61715c1acb975a37e6ba756966ae27f464d6cdc7c8e3aded8e9f3

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