Malicious PDF — malware analysis report

Static analysis result for SHA-256 d83dae85a3770c45…

MALICIOUS

PDF

42.1 KB Created: 2020-03-10 08:15:53 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-07
MD5: 50409d2333324df21797c158c5283244 SHA-1: f44f328df42c884ca7853cefb2bcdceb12a5fe43 SHA-256: d83dae85a3770c45e81ef7357b5d13b41546061e88338b41acaef58ad6de5917
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to uniquely named PDF files on various domains. This pattern is indicative of a link farm or SEO spam campaign, potentially used to distribute malicious content or phish for credentials. The document body itself is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, a tool often abused for creating such spam documents. No scripts were extracted from this sample.

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-63-204-18-45.benefitplans.org/uploads/1/3/0/6/130604056/130604056.html#ergonomic+desk+furniture PDF link annotation
    • http://cuppagusto.com/uploads/1/3/0/5/130542907/rurasesun_gapufovur.pdfIn PDF document text
    • http://www.myminecraft.net/uploads/1/3/0/5/130551641/midanatilasifasepaz.pdfIn PDF document text
    • http://stubblefieldhoa.com/uploads/1/3/0/7/130740073/jujejexoxugujaxun.pdfIn PDF document text
    • http://rebeccalcopper.com/uploads/1/3/0/5/130550940/pupobavela_japuzufa_momiwadupogo.pdfIn PDF document text
    • http://wavylinedesign.com/uploads/1/3/0/2/130288682/ruguwufo-tinupesemogowut-fitababixomoxo-gamimulovoba.pdfIn PDF document text
    • http://guitarhugs.com/uploads/1/3/0/5/130543784/5607205.pdfIn PDF document text
    • http://www.mybiohelp.com/uploads/1/3/0/4/130488946/8a047014fd74.pdfIn PDF document text
    • http://andyknguyen.com/uploads/1/3/0/7/130738568/3e9b392.pdfIn PDF document text
    • http://marwaelkadi.com/uploads/1/3/0/7/130739715/5552465.pdfIn PDF document text
    • http://kuniusedcars.com/uploads/1/3/0/7/130775200/357803.pdfIn PDF document text
    • http://knitlympics.com/uploads/1/3/0/5/130539059/6658683.pdfIn PDF document text
    • http://brunswickaerial.com/uploads/1/3/0/6/130621916/jamobosugofisuper.pdfIn PDF document text
    • http://chronopaths.com/uploads/1/3/0/7/130740072/gujidomom.pdfIn PDF document text
    • http://homecareinlacanada.net/uploads/1/3/0/8/130813710/9269220.pdfIn PDF document text
    • http://chinawindow.biz/uploads/1/3/0/6/130620575/8719196.pdfIn PDF document text
    • http://daveartists.com/uploads/1/3/0/3/130312923/vebaxejo.pdfIn PDF document text
    • http://drashraf.co.uk/uploads/1/3/0/4/130488544/8982824.pdfIn PDF document text
    • http://meddin.space/uploads/1/3/0/5/130539933/jezizamano_kuvipigaxoz.pdfIn PDF document text
    • http://themoviefangirl.com/uploads/1/3/0/7/130740184/tobazokavofiduk-xexel.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 4

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_off00007c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C7F 7800 bytes
SHA-256: 4d3b78085fb829af7331a66f251e3d659acbb7b8f4b9ff173b2701cc778e2a1d

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