Malicious PDF — malware analysis report

Static analysis result for SHA-256 260b9d1cc25361e8…

MALICIOUS

PDF

52.7 KB Created: 2020-03-23 15:43:59 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 911c9a3ead5695fc04d90b11c7dd5cd2 SHA-1: ba40ab91bd72f51436c212364b97715a9c8711af SHA-256: 260b9d1cc25361e85996d36f72dbba1906da214b75bb8180516ab40a5fc8cdb2
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a technique often used for SEO spam or to direct users to malicious sites. The document body, though partially corrupted, contains text related to 'Ejercicios de enlace quimico resueltos 2o bachillerato' and references the wkhtmltopdf generator, suggesting a lure to educational content. The primary heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, with 'divaformkusadasi.com' being a dominant host. The embedded URLs are likely part of this link farm, aiming to drive traffic to potentially compromised or malicious websites.

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://bestyrecruitment.com/uploads/1/3/0/6/130639656/130639656.html#ejercicios+de+enlace+quimico+resueltos+2o+bachillerato PDF link annotation
    • http://divaformkusadasi.com/uploads/1/3/0/5/130551630/33aa6.pdfIn PDF document text
    • http://cleaningservicesedm.ca/uploads/1/3/0/6/130604359/4585135.pdfIn PDF document text
    • http://truckingsafetycrm.com/uploads/1/3/0/5/130588299/bisotajij.pdfIn PDF document text
    • http://www.ransolisprofessionalportfolio.com/uploads/1/3/0/8/130873717/2398655.pdfIn PDF document text
    • http://michelziesecke.com/uploads/1/3/0/3/130323532/xuruvuxesefuti-vitavoz-jonezabexo-togovewena.pdfIn PDF document text
    • http://montessoricasa.org/uploads/1/3/0/7/130740450/95a37472e93c4.pdfIn PDF document text
    • http://tsc-landstar.com/uploads/1/3/0/8/130874205/vonaruvaruxusaxu.pdfIn PDF document text
    • http://the4thleveloffinancialfreedom.com/uploads/1/3/1/1/131164131/6345250.pdfIn PDF document text
    • http://www.theguamwomensclub.com/uploads/1/3/0/7/130775075/25b1b54.pdfIn PDF document text
    • http://ez-pz-pay.com/uploads/1/3/0/6/130621926/7375d5211d.pdfIn PDF document text
    • http://liveinpurpose.net/uploads/1/3/0/6/130639683/61b94d238c.pdfIn PDF document text
    • http://orabuilt.com/uploads/1/3/0/3/130379367/zisujukapo-lefozapen.pdfIn PDF document text
    • http://gaymer.tv/uploads/1/3/0/7/130775762/najejufarufusefemas.pdfIn PDF document text
    • http://namedtrust.com/uploads/1/3/0/3/130323186/luxurudekavima_noranasago_pidipuvuf_nibave.pdfIn PDF document text
    • http://giteruralenfrance.com/uploads/1/3/0/6/130639603/moxukosi.pdfIn PDF document text
    • http://droadllcpa.com/uploads/1/3/0/6/130603888/7718514.pdfIn PDF document text
    • http://connecttechnicalservices.com/uploads/1/3/0/2/130271214/senamebato.pdfIn PDF document text
    • http://simplyfitfoods.com/uploads/1/3/0/7/130739478/d38cce7e1.pdfIn PDF document text
    • http://tanzanyakonsoloslugu.org/uploads/1/3/0/3/130379447/5003810.pdfIn PDF document text
    • http://www.vivsvision.com/uploads/1/3/0/6/130621432/8369629.pdfIn PDF document text
    • http://nataliekasdan.com/uploads/1/3/0/2/130287873/tekenuwedig_japatiwafit_kobor_balokudi.pdfIn PDF document text
    • http://urbanshamanmagic.com/uploads/1/3/0/4/130483728/5ffb1.pdfIn PDF document text
    • http://lmprosolutions.com/uploads/1/3/0/6/130603989/beluxaparigoka-bipuworevomaneb-zusadifisadi.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Related samples 2

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_off00008c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C09 7016 bytes
SHA-256: 3557a70f9633a26724a9682463f0c2361ce1fc118151ce6006b5d6891ec701f0
font_01_sfnt_off00009daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9DAF 10152 bytes
SHA-256: 09b30639a6f2764e88040a00310692f9cc32f781fffc3610351acd6ecbc73f85

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