Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f500bf332737d7…

MALICIOUS

PDF

32.5 KB Created: 2020-06-22 05:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2d886cac7f1cb962bfadf67cc0e9612 SHA-1: b9509fa57481d6377f16a747350d67d767f87094 SHA-256: 16f500bf332737d7764629d2e3413c62cb8f0949436ab9b703b02e4446d054f2
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 of which point to other PDF files hosted on similar domains. This pattern is indicative of a link farm or SEO manipulation scheme. While no scripts were directly extracted, the PDF structure and numerous external links suggest a potential for malicious redirection or content delivery. The ML classifier also strongly flagged this PDF as malicious.

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://waytohelp.org/uploads/1/3/0/8/130874010/130874010.html#ft+worth+entertainment+guide
    • http://parenttoolkitswitzerland.com/uploads/1/3/0/4/130476795/mitupidi.pdf
    • http://beachhouseinsrilanka.com/uploads/1/3/1/4/131407307/vavawodeno_jetobozidime.pdf
    • http://74-123-76-221.mgwnet.com/uploads/1/3/0/2/130289519/loxogewubutot.pdf
    • http://traditionalsustainability.com/uploads/1/3/0/8/130874472/fubawamited-damuza-bojudovuzab.pdf
    • http://nejmandesign.com/uploads/1/3/0/7/130776883/004c02.pdf
    • http://rockyviewstudios.com/uploads/1/3/0/8/130813779/bodimudekov-bopikisikatu.pdf
    • http://sjcraigfencing.com/uploads/1/3/0/7/130739308/a25ba8.pdf
    • http://admin.stardisc.org/uploads/1/3/0/8/130813768/d8a5da8833a7.pdf
    • http://a-199-34-228-100.yuvalamihai.com/uploads/1/3/0/2/130273842/mumusuturivodi-mikubisisa.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004458.bin
e6ee59e69f6541f12e16947645de9e86309ae596e9cbc9610ec2436e4cd58f70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4458 4960 bytes
font_01_sfnt_off0000550e.bin
e400c59fcf827d25f0128ffbc591ee2bb0a18c589bb0ea2debc3a1988f0f8811		 pdf-font-stream PDF embedded font (sfnt) at offset 0x550E 9848 bytes

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