Malicious PDF — malware analysis report

Static analysis result for SHA-256 7639e906e2b7f713…

MALICIOUS

PDF

51.0 KB Created: 2020-04-27 01:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 8f2f0a854581e5b4515c150737238390 SHA-1: 7bd0157e74bd464217225e950ae3d5b659673c16 SHA-256: 7639e906e2b7f713a3984fcfc6b015cf4908f1fa3921ecdd02787fd233de2790
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified as a 'PDF link farm', suggesting a malicious intent to manipulate search engine results or distribute further payloads. The document body, though heavily obfuscated, contains a URL that mirrors the heuristic findings. No scripts were extracted from this sample, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://careaidecommunity.com/uploads/1/3/0/5/130590403/130590403.html#easy+flamenco+guitar+tabs+pdf
    • http://cheetahbus.com/uploads/1/3/0/5/130588830/judusobojotuv.pdf
    • http://hugodobson.com/uploads/1/3/1/4/131453151/somuzasofujoj.pdf
    • http://serenityartandmusic.com/uploads/1/3/0/2/130289603/woride-saroki-zidigigigovami-daluwifesowevag.pdf
    • http://toolsforresilience.com/uploads/1/3/0/5/130551230/nukik-limosodegakeb.pdf
    • http://ericapatelskincare.com/uploads/1/3/1/3/131398215/330fbfefd491.pdf
    • http://maisonbouche.net/uploads/1/3/0/6/130639257/fadopofi.pdf
    • http://stickyecon.com/uploads/1/3/0/9/130969312/377a85.pdf
    • http://arisbay.com/uploads/1/3/0/4/130490774/5450f1fed9f5.pdf
    • http://honeybeebearcandle.com/uploads/1/3/0/7/130739810/jerugaraxuva.pdf
    • http://nofone.net/uploads/1/3/1/3/131398605/selebawazin_kefopedigi_mepuzopajakenij_gojegimusidaw.pdf
    • http://funwoodart.com/uploads/1/3/0/6/130621287/serazunikolomigenek.pdf
    • http://annpreps.com/uploads/1/3/0/7/130740046/f507bd76.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009e31.bin
c8c8cac6cc62b356c124eb85dc635c5e34c6d64b74984765b9d3dd0889d2abba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E31 9504 bytes

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