Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b73865a898818a…

MALICIOUS

PDF

37.5 KB Created: 2020-03-10 12:05:16 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 43f3df1ed82e839fa0ca58be22a54f89 SHA-1: 9749a8e642db96e120d74d1dfc0b1b63d8f691fc SHA-256: f1b73865a898818ae02edaeda3cfb37bdbd624c7b5849e218208d287ff77adfd
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body text, though partially corrupted, includes references to 'Cuestionario ambiente laboral pdf' and 'wkhtmltopdf', suggesting a lure for users to download or view further PDF content. The primary attack pattern involves directing users to a vast array of URLs, likely for SEO poisoning or to host further malicious payloads.

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://taiyangcheng128msc.br3h.com/uploads/1/3/0/5/130588670/130588670.html#cuestionario+ambiente+laboral+pdf PDF link annotation
    • http://pitchstock.net/uploads/1/3/0/8/130815664/3037871.pdfIn PDF document text
    • http://playpass.net/uploads/1/3/0/7/130739652/nonogovoxeriwe-banago-jejum-wunubibewizu.pdfIn PDF document text
    • http://mx.mcdonaldelectrical.com/uploads/1/3/0/4/130436037/lozipuxaxare.pdfIn PDF document text
    • http://yustispizzapasta.site/uploads/1/3/0/3/130312919/7a359da.pdfIn PDF document text
    • http://mrsbulalangtan.com/uploads/1/3/0/4/130489358/kexipo_muxovoxozuka_pabezujif_sulesesi.pdfIn PDF document text
    • http://medschoolcompanion.org/uploads/1/3/0/9/130969726/ganefojowazo.pdfIn PDF document text
    • http://transgenderporno.com/uploads/1/3/0/7/130775982/6ea0ef4ea512c.pdfIn PDF document text
    • http://www.davidreddickart.com/uploads/1/3/0/8/130874523/fakefejo.pdfIn PDF document text
    • http://placegram.net/uploads/1/3/0/2/130271229/begivedokalamo.pdfIn PDF document text
    • http://memeology.org/uploads/1/3/0/8/130874059/7e9693ea9.pdfIn PDF document text
    • http://mail.taraflyart.com/uploads/1/3/0/4/130435680/duzoxumeloto-juwezutajode.pdfIn PDF document text
    • http://www.starburstactivation.org/uploads/1/3/0/5/130551066/2c5f980e0.pdfIn PDF document text
    • http://www.evilsupervillain.com/uploads/1/3/0/5/130539871/vobituravuna_sofisezene_nimupizitiz.pdfIn PDF document text
    • http://yiechan.com/uploads/1/3/0/5/130551135/9192064.pdfIn PDF document text
    • http://thanks.republican/uploads/1/3/0/7/130739928/c4e399.pdfIn PDF document text
    • http://pastelvoids.net/uploads/1/3/0/5/130546497/8433770.pdfIn PDF document text
    • http://btbsocceracademy.ca/uploads/1/3/0/4/130490928/9495714.pdfIn PDF document text
    • http://donttakemysunshine.com/uploads/1/3/0/6/130639869/52f457e5ddcff.pdfIn PDF document text
    • http://kateycrews.net/uploads/1/3/0/5/130588518/2599554.pdfIn PDF document text
    • http://www.tgsanderson.com.au/uploads/1/3/0/4/130483986/zulajiles_tubupexu_mujinupepebulom_devuw.pdfIn PDF document text
    • http://realtybootstrap.com/uploads/1/3/0/6/130620436/a139ecced569.pdfIn PDF document text
    • http://shireairconditioning.com/uploads/1/3/0/3/130323968/mesudoripes.pdfIn PDF document text
    • http://www.livebake.com.au/uploads/1/3/0/2/130288864/pagokapudilo_pagapu_mulotawogokajol.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 1

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_off00006978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6978 8376 bytes
SHA-256: dcfd9612a40bcb7b7aa3fe69d58475fa69096634d165dcaf16cbdcd70df1e012

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