Malicious PDF — malware analysis report

Static analysis result for SHA-256 b20939ce8e7927fa…

MALICIOUS

PDF

39.5 KB Created: 2020-04-03 00:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: b1c3dc3bdf8bd98c27b222d60af5d0d5 SHA-1: 75557eab2d603365bc3343333114258bf077f673 SHA-256: b20939ce8e7927fae469fbe326df35c0582f7d0626c724d81362135a62789f94
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 hosted on similar domains. This suggests a link farm or redirection strategy to obscure the ultimate malicious destination. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into clicking through to malicious content. No scripts were extracted from this sample, limiting the ability to determine specific payload delivery mechanisms.

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://mercaditosustentable.com/uploads/1/3/1/4/131437352/131437352.html#perception+deception+pdf+download PDF link annotation
    • http://victoriajadeparker.com/uploads/1/3/0/5/130588611/4153962.pdfIn PDF document text
    • http://personalshoppinglady.com/uploads/1/3/0/7/130739517/43d81e7f.pdfIn PDF document text
    • http://hiung.net/uploads/1/3/1/1/131164399/8331850.pdfIn PDF document text
    • http://divercitycyle.net/uploads/1/3/0/8/130814645/6066518.pdfIn PDF document text
    • http://just-a-bite-treats.com/uploads/1/3/0/6/130605072/9269348.pdfIn PDF document text
    • http://thomasmontero.com/uploads/1/3/0/6/130621942/fe15b.pdfIn PDF document text
    • http://sescosecurityservices.com/uploads/1/3/0/3/130380084/789906f0af7689b.pdfIn PDF document text
    • http://fullofsmilesgifts.com/uploads/1/3/0/7/130739159/e0c85.pdfIn PDF document text
    • http://dynamichumancapital.org/uploads/1/3/0/2/130289623/zufalafa.pdfIn PDF document text
    • http://wirelessaccountant.ca/uploads/1/3/1/0/131070498/mutufederon_sesibalu.pdfIn PDF document text
    • http://bandbcleaningservices.com/uploads/1/3/0/8/130813965/gepaparopa_jovap_dabesetun_sikusatabat.pdfIn PDF document text
    • http://artezenstudio.com/uploads/1/3/1/3/131384402/kawesori.pdfIn PDF document text
    • http://amazingkreationssc.net/uploads/1/3/0/5/130542860/tubudujufisazex.pdfIn PDF document text
    • http://tipsforcluelessmen.com/uploads/1/3/0/7/130739165/4c752.pdfIn PDF document text
    • http://7wcowhorses.com/uploads/1/3/1/0/131070080/2877788.pdfIn PDF document text
    • http://otleyart.com/uploads/1/3/0/3/130313166/lafuzogi.pdfIn PDF document text
    • http://kdcakes.net/uploads/1/3/0/7/130775197/dcdc6.pdfIn PDF document text
    • http://virtualrealitygalaxy.com/uploads/1/3/0/8/130874260/78f4ddf8.pdfIn PDF document text
    • http://alwayscal.com/uploads/1/3/1/4/131407351/2033481.pdfIn PDF document text
    • http://docsquads.org/uploads/1/3/0/3/130312972/9753dac6.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_off00007187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7187 7944 bytes
SHA-256: 8495dd03c1c0a25f3f64e6de7e0273dd3034470422bd63d5dbb8379f905175fc

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