Malicious PDF — malware analysis report

Static analysis result for SHA-256 76e2fb7d24de0db8…

MALICIOUS

PDF

55.7 KB Created: 2020-04-26 01:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-04
MD5: d219a6e9ef2d4bf94203c6961c9dad97 SHA-1: 11ee9de5970e8f6bb0ecd37649c6ac759c52bab3 SHA-256: 76e2fb7d24de0db8d85c0b90a1afc1c2deaa42c5115e825c6c51a055ceed39cd
104 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to other PDF files, suggesting a link farm or a method to host further malicious content. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to trick users into downloading potentially harmful files. The document body, though heavily obfuscated, contains a URL that aligns with the detected malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://excursoessmtriptour.com/uploads/1/3/0/5/130550809/130550809.html#pokemon+blazed+glazed+guide PDF link annotation
    • http://sfpbfun.com/uploads/1/3/0/8/130873986/9eefad8f.pdfIn PDF document text
    • http://lorellesflashypoodles.com/uploads/1/3/1/6/131606174/pegurutotod.pdfIn PDF document text
    • http://gaughanpsychkc.com/uploads/1/3/0/5/130543743/dufotawa.pdfIn PDF document text
    • http://ximvoodoo.com/uploads/1/3/1/4/131482850/531633.pdfIn PDF document text
    • http://kristahaataja.com/uploads/1/3/0/5/130541950/2425644.pdfIn PDF document text
    • http://quotesforannuities.com/uploads/1/3/0/8/130815726/f2430eabf55.pdfIn PDF document text
    • http://biibiichildcare.com/uploads/1/3/1/3/131384374/gigezefakas.pdfIn PDF document text
    • http://eagles-institute.com/uploads/1/3/1/3/131398250/07e45415c4226.pdfIn PDF document text
    • http://the30minutewar.com/uploads/1/3/0/5/130588597/f402cc.pdfIn PDF document text
    • http://cavinesslegacy.com/uploads/1/3/1/0/131070302/97dd7b74.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C4D 8800 bytes
SHA-256: 886bbe9a30304eecf477717a51707310e1072e3702c0973d36cfbb31a796802e
font_01_sfnt_off0000bdc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDC3 16036 bytes
SHA-256: 779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63