Malicious PDF — malware analysis report

Static analysis result for SHA-256 994dfa6083718c51…

MALICIOUS

PDF

43.0 KB Created: 2020-03-22 04:54:00 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-08-25
MD5: d273ee6363857814b897af5973991903 SHA-1: aa37744a2549c796dacfe3b609c76f1da72075ae SHA-256: 994dfa6083718c51f4169916159f7514f46781321c3348cc93b0d1f3f57eb6d6
136 Risk Score

Malware Insights

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

The PDF document contains a large number of external links to other PDF files hosted on various domains, a technique often used for SEO poisoning or to distribute malware. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a link farm designed to redirect users. No scripts were extracted, but the sheer volume of outbound links points to a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://wesleyanmomsclub.org/uploads/1/3/0/6/130604557/130604557.html#crop-a-dile+iitm+big+bite+punch PDF link annotation
    • http://equimg.com/uploads/1/3/0/8/130873869/zupukeru.pdfIn PDF document text
    • http://www.chopshopsaladshop.com/uploads/1/3/0/7/130740077/zoxerewejode.pdfIn PDF document text
    • http://stpfloraldesign.org/uploads/1/3/0/4/130476150/9888646.pdfIn PDF document text
    • http://dehost-server.lv01.hendersonchamber.com/uploads/1/3/0/6/130620614/9832030.pdfIn PDF document text
    • http://missiontriangle.us/uploads/1/3/1/0/131071021/7d39cb3fc.pdfIn PDF document text
    • http://redmaplemarketingagency.com/uploads/1/3/0/2/130271184/zaresodexuvewe-rabujum-xisegikugipe.pdfIn PDF document text
    • http://reifierentertainmentdevelopment.com/uploads/1/3/0/5/130588678/jutubowajib_fobilulaxoniso.pdfIn PDF document text
    • http://huraworld.com/uploads/1/3/0/3/130379331/8962037.pdfIn PDF document text
    • http://vaycaypros.com/uploads/1/3/0/5/130588389/zapux-jiruzoke.pdfIn PDF document text
    • http://josephbeggsfoundation.org/uploads/1/3/0/7/130739510/tesufi.pdfIn PDF document text
    • http://www.hdpetrochemicalsolution.com/uploads/1/3/0/9/130969991/908496.pdfIn PDF document text
    • http://www.myamazingwatches.com/uploads/1/3/0/6/130621096/3698211.pdfIn PDF document text
    • http://peddlerscache.com/uploads/1/3/0/5/130588433/7536237.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn 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_off00007465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7465 8688 bytes
SHA-256: f2c3941b8b9105d69a2379c8bf57d65585e7a9406d990e73ba212ed434f1db60
font_01_sfnt_off00009589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9589 2616 bytes
SHA-256: d907c570f1f8f2d62f38d7529dbf77de46ca3a1917ec53aca7a78bae59874b04

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