Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dc4772cab9bd23b…

MALICIOUS

PDF

41.2 KB Created: 2020-03-28 07:09:41 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: a67214d7670d5eef6d05e41b0ca9d09c SHA-1: 5778e8050e1d6d50c38990d1ca86df9e8199dcce SHA-256: 3dc4772cab9bd23bf2fdc43dc0f9c99dc43a32038ae1aef82aeeda75f859bcdd
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The primary URL, http://thismaycomeinhandy.com/uploads/1/3/1/1/131164152/131164152.html#twelfth+night+test, and many others point to PDF files hosted on various domains. This suggests a link farm or SEO manipulation tactic, potentially used to distribute malicious content or pages. The ML classifier also strongly indicated maliciousness.

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://thismaycomeinhandy.com/uploads/1/3/1/1/131164152/131164152.html#twelfth+night+test PDF link annotation
    • http://christianfellowshipgoldriver.com/uploads/1/3/0/9/130969648/dorelikonol_wikubakijelorum_moxaz.pdfIn PDF document text
    • http://www.gtwutu72.org/uploads/1/3/0/6/130603929/1991792.pdfIn PDF document text
    • http://pinupanddance.com/uploads/1/3/0/8/130813364/kufafufoxar_jexoz_nusuwopazusuxu.pdfIn PDF document text
    • http://jvconsortium.com/uploads/1/3/0/6/130605133/1897372.pdfIn PDF document text
    • http://maggimeistari.is/uploads/1/3/0/6/130621754/jesubomuzometesidata.pdfIn PDF document text
    • http://www.parishcup.org/uploads/1/3/0/4/130436492/1208311.pdfIn PDF document text
    • http://debbiechristie.com/uploads/1/3/0/5/130545396/xenobovavapijerala.pdfIn PDF document text
    • http://www.beijingshinryukan.com/uploads/1/3/0/6/130640114/memeganuwa.pdfIn PDF document text
    • http://mishakaura.com/uploads/1/3/0/6/130639263/5219749.pdfIn PDF document text
    • http://menporium.com/uploads/1/3/0/4/130435820/fezogubuzekezup.pdfIn PDF document text
    • http://safehighwaydisplays.com/uploads/1/3/0/7/130738841/betapivowekapo.pdfIn PDF document text
    • http://f-ckprobably.com/uploads/1/3/0/6/130604414/9996774.pdfIn PDF document text
    • http://gogreenofficespace.org/uploads/1/3/0/6/130604225/semivumoziw.pdfIn PDF document text
    • http://noahguystaffing.com/uploads/1/3/0/4/130483184/nipigupukar.pdfIn PDF document text
    • http://beyondpotential.ca/uploads/1/3/0/4/130488574/5015935.pdfIn PDF document text
    • http://signalhill.com.au/uploads/1/3/0/6/130604203/lominipaduj.pdfIn PDF document text
    • http://linda-schubert.com/uploads/1/3/0/5/130551618/datazeko_pafavujeved_ruvelejafiro.pdfIn PDF document text
    • http://dns.mauidreamer.com/uploads/1/3/0/7/130739916/fefamulok.pdfIn PDF document text
    • http://salonbeauchesnestudio.com/uploads/1/3/0/7/130739493/576725.pdfIn PDF document text
    • http://deebynum.com/uploads/1/3/0/8/130873864/896149d080.pdfIn PDF document text
    • http://earnestaudio.com/uploads/1/3/0/4/130489247/zelemopafalig-bexonog-dewifedudubagat.pdfIn PDF document text
    • http://idealmedikal.com/uploads/1/3/0/4/130435745/5195402.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

Related samples 2

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

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000077b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77B6 8284 bytes
SHA-256: 9e613ded5dab1d647346b0f1a3a4b0731cbd57ac917d99550f100be0a9b37d80

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