Malicious PDF — malware analysis report

Static analysis result for SHA-256 0afb463ece3cdfe0…

MALICIOUS

PDF

79.7 KB Created: 2020-06-19 20:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31554d9450b118ce59d2f5e2954e88a0 SHA-1: 4c42d8dcc8d449a4fc388dd53155af08847094b1 SHA-256: 0afb463ece3cdfe03e5deda975584be2ef942c4df94e30a306dfc0c5faaa27a1
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The document body, though partially obfuscated, includes a URL that points to a collection of other PDF files, suggesting a link-farming or redirection scheme. The ML classifier also strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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://candyheartphotographer.com/uploads/1/3/2/6/132696526/132696526.html#wholesome+baby+food+guide+book
    • http://xn--i8sp6y4r4b.com/uploads/1/3/1/8/131856062/7b6c9d011e.pdf
    • http://iran-water-nexus.net/uploads/1/3/0/6/130621847/8903714.pdf
    • http://xvandy.com/uploads/1/3/0/6/130620521/woxejuxuga.pdf
    • http://mail.iwaizmir.com/uploads/1/3/1/4/131453086/5731a.pdf
    • http://beautyfacespa.com/uploads/1/3/1/3/131398064/jijitimaduj.pdf
    • http://stanthonyoakville.ca/uploads/1/3/0/5/130550654/9709880.pdf
    • http://clouttrain.net/uploads/1/3/0/7/130775897/seraba.pdf
    • http://moonlightled.ca/uploads/1/3/0/2/130271030/bd61e8c3ec.pdf
    • http://parkerdancecompany.net/uploads/1/3/0/7/130739287/d85d856d83b31a9.pdf
    • http://ajcivilconstruction.com/uploads/1/3/0/5/130588497/1d3a8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3b2.bin
d6723ee56b84f33867cc0bebb344ae2851031a16ccaca388554bffb0520e5f64		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B2 5240 bytes
font_01_sfnt_off0000f597.bin
6654982fc64f485d79bd9d48d0dbb88d79f67b392030b7c7531e31b5458f59d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF597 11588 bytes
font_02_sfnt_off00011cc8.bin
43b9158ab89342745c74817ed02a941a7d74bf2e88754a36b56b87fbb11998d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC8 16204 bytes

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