Malicious PDF — malware analysis report

Static analysis result for SHA-256 2319f303de90570d…

MALICIOUS

PDF

40.6 KB Created: 2020-03-23 14:08:47 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-08-25
MD5: a983ef66248fa2473c5a949479c8b92d SHA-1: 8ba5a44f59be9a923336f500a9971569f81a5153 SHA-256: 2319f303de90570d9a545a58ded5110074a9ba56af0e979f48309c4f5be23f6f
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files on various domains. This behavior is indicative of a link farm or a mechanism to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine the exact payload or lure.

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://youngkingaudio.com/uploads/1/3/0/6/130621614/130621614.html#hunter+s+thompson+on+david+letterman PDF link annotation
    • http://rappel-tireuseabiere.fr/uploads/1/3/0/7/130739280/megoviz.pdfIn PDF document text
    • http://remsofflorida.com/uploads/1/3/0/7/130739578/81505.pdfIn PDF document text
    • http://the-joy-of-syntax.com/uploads/1/3/0/6/130621422/6f6c3071407a.pdfIn PDF document text
    • http://cpsaltlakecity.com/uploads/1/3/0/4/130483848/1234497.pdfIn PDF document text
    • http://www.frozenmetroid.co.uk/uploads/1/3/0/5/130589322/875005.pdfIn PDF document text
    • http://realestatelearningnetwork.org/uploads/1/3/0/2/130270946/wupazamazuwuzuk.pdfIn PDF document text
    • http://sami-itc.com/uploads/1/3/0/5/130551445/13dca290a851.pdfIn PDF document text
    • http://getifi.com/uploads/1/3/0/7/130739503/9857258.pdfIn PDF document text
    • http://www.somertonconcertband.com/uploads/1/3/0/7/130740074/3af44b.pdfIn PDF document text
    • http://longroadtrans.net/uploads/1/3/0/5/130589161/zavafizelabemibowi.pdfIn PDF document text
    • http://directprocessservers.com/uploads/1/3/0/6/130603997/kefixegu-dovizubapog.pdfIn PDF document text
    • http://russhutchison.com/uploads/1/3/0/5/130550868/7934288.pdfIn PDF document text
    • http://www.yourxxtra.com/uploads/1/3/0/7/130739971/2754930.pdfIn PDF document text
    • http://nonprofitsupport.info/uploads/1/3/0/8/130814122/2fcb6d0889.pdfIn PDF document text
    • http://bdbgeneralcontractor.com/uploads/1/3/0/5/130589158/kibuv-xozojekujubex-lakitin-datumojod.pdfIn PDF document text
    • http://rewildmedicine.com/uploads/1/3/0/6/130604666/b6ced4ab5dd.pdfIn PDF document text
    • http://duracellcwt.com/uploads/1/3/0/8/130874305/jawaxanesej.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 1

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_off000074bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74BF 8376 bytes
SHA-256: 2f765c052985aa9c54fcea5dd536faf8e312b934cedf8ce0f457436fe20c05d5

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