Malicious PDF — malware analysis report

Static analysis result for SHA-256 637c3e0f924c2bdf…

MALICIOUS

PDF

39.3 KB Created: 2020-03-25 07:54:11 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 25a013ea7876352fc9d27248b456d94b SHA-1: 823dc3866c710de22f82af1b20bcbe00da8fbe0c SHA-256: 637c3e0f924c2bdfe9ecb46ef1c68f7894345fcaeae723fd6fb8b9ca73920cf0
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links to external websites, many of which appear to be part of a link farm designed to distribute malicious content. The primary URL points to a page with a title suggesting a movie download, likely a lure. The ML classifier strongly indicated maliciousness, supporting the interpretation of this PDF as a distribution vehicle.

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://alive-tattoo.com/uploads/1/3/0/4/130488773/130488773.html#olhos+famintos+3+dublado+download+utorrent
    • http://www.prakashayoga.com/uploads/1/3/0/2/130289163/gonexavasegimos.pdf
    • http://ttfurnishing.com/uploads/1/3/0/7/130776262/7b8922d908.pdf
    • http://www.sugarbushfairies.com/uploads/1/3/0/7/130776421/929fcc620.pdf
    • http://hostmaster.blisjournal.org/uploads/1/3/0/5/130588205/9500825.pdf
    • http://tsapreprogram.com/uploads/1/3/0/5/130588703/wujabosiwa.pdf
    • http://drhiltonkaplan.com/uploads/1/3/0/9/130969226/rapimakuz-jopopase-kumomamuw-rixadafupu.pdf
    • http://www.bulliednomore.ca/uploads/1/3/0/6/130604740/suradekozigirobemot.pdf
    • http://flavoreffects.com/uploads/1/3/0/5/130542996/pexobo.pdf
    • http://pqlpottery.com/uploads/1/3/0/6/130639810/cde8fdc03.pdf
    • http://musictheoryworksheet.com/uploads/1/3/0/5/130590403/davugikogunakirupik.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_off00006a54.bin
0747b46510fa73b158e987a4603c2fa20c12dcb2d3121f26933a0bc7ef65f5d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A54 11076 bytes

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