Malicious PDF — malware analysis report

Static analysis result for SHA-256 a86df39ce05cc223…

MALICIOUS

PDF

52.1 KB Created: 2020-03-31 06:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-07
MD5: f8cce73aaee2e778ad0c4f5d01fb0742 SHA-1: 5df3ba9c2f745f56816fb95e4d8ed329bb2efe2d SHA-256: a86df39ce05cc223b1dae7e4e961a5366fcd97e08b21eea4bd8a671cfd404893
104 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm or a mechanism to distribute malicious content. The document body, though heavily obfuscated, contains a URL that appears to be a lure for 'reverse engineering for beginners free pdf', suggesting a social engineering pretext to encourage downloads.

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://surfsidecollies.com/uploads/1/3/0/5/130588732/130588732.html#reverse+engineering+for+beginners+free+pdf PDF link annotation
    • http://testumbrella.com/uploads/1/3/0/6/130639634/00b91.pdfIn PDF document text
    • http://edda-italia.com/uploads/1/3/0/7/130776076/61a114c0bbdf.pdfIn PDF document text
    • http://mulherinfoundation.org/uploads/1/3/0/6/130639811/538238cc6ba.pdfIn PDF document text
    • http://oilcleanserstore.com/uploads/1/3/1/0/131070116/dfcd829fa631.pdfIn PDF document text
    • http://lealeocreative.com/uploads/1/3/0/4/130488228/bikizolixo.pdfIn PDF document text
    • http://www.veritascoffeeco.com/uploads/1/3/1/4/131454770/midesozakodinap_vumesiwo_budovex_vefaxov.pdfIn PDF document text
    • http://denvermarriage.support/uploads/1/3/0/6/130639632/2e9f4b9338f4.pdfIn PDF document text
    • http://caprateig.com/uploads/1/3/0/9/130969016/gojoxolewijopa.pdfIn PDF document text
    • http://crotonlife.nl/uploads/1/3/0/4/130476721/6593474.pdfIn PDF document text
    • http://trydesertsky.com/uploads/1/3/0/8/130814189/795055c.pdfIn PDF document text
    • http://lionizedvideo.com/uploads/1/3/0/3/130313555/7604539.pdfIn PDF document text
    • http://celebrategreaterplymouth.com/uploads/1/3/1/3/131379040/xarasamog.pdfIn PDF document text
    • http://midlandsfestivalofflight.com/uploads/1/3/0/8/130813650/627e9.pdfIn PDF document text
    • http://turnkeysecuritysolutions.com/uploads/1/3/0/5/130543945/pasudux_lelojiwa.pdfIn PDF document text
    • http://catsfirstspayclinic.com/uploads/1/3/0/7/130739897/zokona.pdfIn PDF document text
    • http://nicholassjohnson.com/uploads/1/3/0/5/130550785/wabaduw.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000089fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89FE 9472 bytes
SHA-256: ad6709442e937ba7e83ce085cd21f7ef9bc9683fe65d8c39569207f3527af9a9
font_01_sfnt_off0000ad2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD2D 16312 bytes
SHA-256: 1d1fa5121415f8f5353993473374918b9d2a38f433752094af4cce5d3be72c8c

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