Malicious PDF — malware analysis report

Static analysis result for SHA-256 73103f6f90beaaae…

MALICIOUS

PDF

47.7 KB Created: 2020-03-29 09:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-07
MD5: ba401edc0e39963a610ba4cd030053d9 SHA-1: fc8120bd14e7daea316059dd767ba82f2fe4abe4 SHA-256: 73103f6f90beaaae2d88234057d0bce8ca5634564f8e5640ad6550b0a965bae5
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files with numeric slugs, indicative of a link farm or SEO spam tactic. The document body, though partially corrupted, contains text related to educational planning and references the wkhtmltopdf tool, suggesting a lure. The presence of numerous external URLs strongly suggests an attempt to redirect the user to malicious or spam content, likely for further exploitation or phishing.

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://adsl-63-204-18-21.benefitplans.org/uploads/1/3/0/4/130483520/130483520.html#ejemplo+de+planeaci%C3%B3n+de+una+secuencia+did%C3%A1ctica PDF link annotation
    • http://gogetitconference.com/uploads/1/3/0/7/130776718/saxezulezuloba-tojozazuka.pdfIn PDF document text
    • http://opencloud.us/uploads/1/3/0/7/130740378/ca356f27edbac8.pdfIn PDF document text
    • http://burningfiddleproductions.org/uploads/1/3/0/5/130588506/900d0e6f96550.pdfIn PDF document text
    • http://mta-sts.kyriegallery.com/uploads/1/3/0/2/130273845/josakelizotalox.pdfIn PDF document text
    • http://inmanenergy.com/uploads/1/3/1/1/131164120/gomebutonemajerijudu.pdfIn PDF document text
    • http://sendyouasong.com/uploads/1/3/0/6/130639853/nosebig-lunojinedenakas-zuraletunuvigu-juzaxilir.pdfIn PDF document text
    • http://www.pattilooneypro.com/uploads/1/3/0/5/130539416/9587543.pdfIn PDF document text
    • http://legacyfarmsllc.net/uploads/1/3/0/7/130739290/5f8c79044c6ad.pdfIn PDF document text
    • http://optimalhospicefoundation.org/uploads/1/3/0/3/130323892/zalanu.pdfIn PDF document text
    • http://brochuaccounting.com/uploads/1/3/0/3/130323817/9665903.pdfIn PDF document text
    • http://toysdayout.com/uploads/1/3/0/4/130436242/3952212.pdfIn PDF document text
    • http://www.aftris.com/uploads/1/3/0/5/130590435/fbc2494fc.pdfIn PDF document text
    • http://suemoraes.com/uploads/1/3/0/6/130639400/muromaw_towesixid.pdfIn PDF document text
    • http://bigislandxxx.com/uploads/1/3/0/2/130291373/xegatelum.pdfIn PDF document text
    • http://faceiso.org/uploads/1/3/0/5/130551651/1774626.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7886 9376 bytes
SHA-256: ec986876e0d14dad3fbd5628073b03d2559a5fa1e5cb16b3074e39e20324f98f
font_01_sfnt_off000099fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99FE 16036 bytes
SHA-256: 779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63

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