Malicious PDF — malware analysis report

Static analysis result for SHA-256 996a00cb091010b9…

MALICIOUS

PDF

40.0 KB Created: 2020-04-15 04:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-04
MD5: 30759f1c434d392e215798a79a9bb2de SHA-1: aa6c7d266c2659484aad352c47cbdd4c1f94c376 SHA-256: 996a00cb091010b93236465052ad8a8c478d15b727496879914a4b7729a28067
104 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to other PDF files hosted on various domains. The presence of a 'download button' heuristic and the overall structure suggest a lure to download further malicious content. The document body contains garbled text and references to 'machinarium apk revdl', indicating a potential attempt to trick users into downloading software. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://brennangcservices.com/uploads/1/3/1/3/131398491/131398491.html#machinarium+apk+revdl PDF link annotation
    • http://fencingokc.com/uploads/1/3/1/4/131454791/0883d6b8.pdfIn PDF document text
    • http://weefoal.org/uploads/1/3/0/6/130639958/zojizevapadapa.pdfIn PDF document text
    • http://laprairie-bella.nl/uploads/1/3/0/9/130970023/fimiju-goguzowuva-dovebu-tagevinukajazur.pdfIn PDF document text
    • http://shinethrive.com/uploads/1/3/0/8/130874308/novuzapobibeme.pdfIn PDF document text
    • http://delinawells.com/uploads/1/3/1/0/131071315/2924322.pdfIn PDF document text
    • http://maduarteconstructioninc.com/uploads/1/3/0/7/130740051/5788969.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_off0000728e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x728E 8480 bytes
SHA-256: 1eae15aa2ce21647cd73333805d1108cfe2f15df60d78374b9c03d3b7f616fc7

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