Malicious PDF — malware analysis report

Static analysis result for SHA-256 18c2b72c1e42ed52…

MALICIOUS

PDF

30.8 KB Created: 2020-04-14 10:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ae90e0e6182c9e57ec80f88c00fd0235 SHA-1: 6836396777836cef3920bf3d898ac8e9c00bec51 SHA-256: 18c2b72c1e42ed521fedbcaa48b36889996a89ebab34977b686b20be21c83ce7
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDFs hosted on various domains. This pattern is indicative of a link farm or SEO manipulation scheme, often used to generate traffic or host malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the interpretation that these links are part of a malicious campaign. No scripts were extracted, but the presence of numerous external URLs suggests a redirection or download attempt.

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://marythumma.com/uploads/1/3/0/8/130813554/130813554.html#tera+happy+birthday+song++ringtone
    • http://sugarbombshop.com/uploads/1/3/1/4/131483772/47baf57eeb9.pdf
    • http://cuzzllc.com/uploads/1/3/0/9/130969727/vavurabuvorezis_jaxif.pdf
    • http://topgunconstructionandconsulting.com/uploads/1/3/1/4/131436980/rasazoforajiru.pdf
    • http://dominantballergroup.com/uploads/1/3/0/4/130488312/9237cc.pdf
    • http://customthreads.net/uploads/1/3/0/9/130968933/pifigoxux.pdf
    • http://okaythatstrending.com/uploads/1/3/0/7/130738562/pitizitokutip-wexov.pdf
    • http://dominionchapelusa.org/uploads/1/3/1/4/131437308/7c4b511f18b1.pdf
    • http://mhrinvestments.com/uploads/1/3/0/4/130483551/6461882.pdf
    • http://niagaratutors.ca/uploads/1/3/0/3/130323155/1200594.pdf
    • http://sawcuttingphoenix.com/uploads/1/3/1/1/131164077/xoraliwagusa-fijafusazev-vetupanuwikemad-terivobota.pdf
    • http://journeysofalifetime.net/uploads/1/3/0/6/130604030/zipuzo.pdf
    • http://obieementor.com/uploads/1/3/0/8/130874143/motalexelatuge_modele_lamawukukojejob_pilazuxozuvero.pdf
    • http://cmmrizzi.com/uploads/1/3/0/7/130776177/3607390.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_off00005289.bin
4057cd15a171cffaeeb9e882b8887b7014769c0dbbb95e6d62db369205b540f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5289 7136 bytes

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