Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f31852da373c8d…

MALICIOUS

PDF

69.4 KB Created: 2020-03-30 15:36:23 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2026-05-07
MD5: 1cdc2a45e9256e71a75b02957afca23c SHA-1: 7ea4a7f45ad88a3a8f688ecf0789e2cbe736f542 SHA-256: b5f31852da373c8d4118a8f8a3cab8a4dba111a2bfa5e54576f1fa1107ce992d
104 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm or SEO poisoning tactic. One of the embedded links, 'http://host115.carmichaelnl.com/uploads/1/3/0/4/130476492/130476492.html#python+visual+quickstart+guide+3rd+edition+pdf+download', is presented as a download for a technical guide, likely a lure to download a malicious payload. No scripts were extracted from this sample.

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.
  • 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://host115.carmichaelnl.com/uploads/1/3/0/4/130476492/130476492.html#python+visual+quickstart+guide+3rd+edition+pdf+download PDF link annotation
    • http://mrsheridanenglish.com/uploads/1/3/0/7/130776257/kabekevewewatop-piwubugibifis-viroxepuwitimov-rokesulinusa.pdfIn PDF document text
    • http://criticalpractitioners.com/uploads/1/3/0/6/130620530/2039870.pdfIn PDF document text
    • http://grafreakdesign.com/uploads/1/3/0/2/130272577/rigakilajelado-rugamogiwumaxab.pdfIn PDF document text
    • http://spartancyclist.com/uploads/1/3/0/2/130289279/xunewo.pdfIn PDF document text
    • http://reallyartsltd.com/uploads/1/3/0/6/130621405/zizubumono-welom.pdfIn PDF document text
    • http://furevents.melbourne/uploads/1/3/0/6/130621304/motogazidulapa.pdfIn PDF document text
    • http://rootsfunctionalmedicine.org/uploads/1/3/0/4/130494478/ad36aa.pdfIn PDF document text
    • http://piridesi.com/uploads/1/3/0/3/130313346/lelilevefokuloniwin.pdfIn PDF document text
    • http://www.easeupyourlife.com/uploads/1/3/0/6/130620326/1013fc.pdfIn PDF document text
    • http://oraciontextual.com/uploads/1/3/0/5/130589315/39e8adfbc.pdfIn PDF document text
    • http://scovnaturalwellness.com/uploads/1/3/0/8/130814232/3742214.pdfIn PDF document text
    • http://carrielcopeland.com/uploads/1/3/0/6/130620515/f22539441.pdfIn PDF document text
    • http://jantilsonfitness.com/uploads/1/3/0/9/130969090/najovon.pdfIn PDF document text
    • http://stackedoddstuning.com/uploads/1/3/0/6/130621312/besafu.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 7

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_off0000dfed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFED 11012 bytes
SHA-256: 20372bd1046ba26f3a01c35aa4ca87b6e817e474ed20a8e2cdd0fbc5ce6524a4

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