Malicious PDF — malware analysis report

Static analysis result for SHA-256 94b4aeb4deca1ffb…

MALICIOUS

PDF

38.7 KB Created: 2020-03-29 06:06:08 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 457c926e44bb11a3f05aabf66bbe0a49 SHA-1: fdb4a758935b9ef4b2ae1226e2ba6963576485d3 SHA-256: 94b4aeb4deca1ffbb63ee1d6fad8e7be858e3768bdbaccb3041111f0f559b37a
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 document body text, though partially corrupted, includes a reference to 'Desafios matematicos 6to grado contestado', suggesting a lure. The primary attack pattern involves directing users to a vast collection of external PDF files hosted across numerous domains. 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://rehphotography.org/uploads/1/3/0/4/130488851/130488851.html#desafios+matematicos+6to+grado+contestado PDF link annotation
    • http://www.surfacesrestored.ca/uploads/1/3/0/6/130603878/7796624.pdfIn PDF document text
    • http://darlingtonteapartyrental.com/uploads/1/3/0/6/130604085/muwavotififep_ratorasol_wetonusa.pdfIn PDF document text
    • http://thetimeittakes.me/uploads/1/3/0/6/130622042/wunetalebored.pdfIn PDF document text
    • http://talesofbloodandbone.com/uploads/1/3/0/7/130775786/46237.pdfIn PDF document text
    • http://isellthis.net/uploads/1/3/0/3/130313123/xisajas.pdfIn PDF document text
    • http://folkscore.com/uploads/1/3/0/4/130476632/7651078.pdfIn PDF document text
    • http://mta-sts.mx.paradisevalleyequine.com/uploads/1/3/0/5/130588613/4d8b6b3cf1b76.pdfIn PDF document text
    • http://nakedpavementbooks.com/uploads/1/3/0/6/130622025/pudirazasoroleferoz.pdfIn PDF document text
    • http://crankshaftmotorcarclub.com/uploads/1/3/0/7/130739210/gevine-mewime-wegof.pdfIn PDF document text
    • http://bellbookcandle.net/uploads/1/3/0/3/130379315/db6ee77d.pdfIn PDF document text
    • http://2bepotencialhumano.com/uploads/1/3/0/8/130874524/7d0723152574.pdfIn PDF document text
    • http://www.deatonart.com/uploads/1/3/0/7/130738511/libizakadod.pdfIn PDF document text
    • http://burksbees.com/uploads/1/3/0/3/130323934/9733049.pdfIn PDF document text
    • http://oxbowfarmny.com/uploads/1/3/0/6/130621487/gitebufodopiduzawi.pdfIn PDF document text
    • http://brianecorbin.com/uploads/1/3/0/8/130874434/domupepewoxirog-zabegudeb-fevefodakomu-jijokanez.pdfIn PDF document text
    • http://nerangrewards.com/uploads/1/3/0/2/130271073/nedisutabegezu-doxutanudug-kowagekepiw-fowawitisi.pdfIn PDF document text
    • http://rockymountainhomeinvestors.com/uploads/1/3/0/6/130604111/2798226.pdfIn PDF document text
    • http://basilandwoodie.com/uploads/1/3/0/3/130313403/8d60333b88.pdfIn PDF document text
    • http://www.employomaha.com/uploads/1/3/0/9/130969461/fajiputidoko_zovodopanikuj_xiruradol_rujigo.pdfIn PDF document text
    • http://gracemusicnyack.org/uploads/1/3/0/5/130550948/xuxevewinixutigo.pdfIn PDF document text
    • http://host.regenexxservices.com/uploads/1/3/0/5/130590700/dizevasepoxor.pdfIn PDF document text
    • http://woman2woman.net/uploads/1/3/0/5/130551433/463693.pdfIn PDF document text
    • http://atlashcare.com/uploads/1/3/0/6/130639263/003030227ed73.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_off00006ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CE7 8800 bytes
SHA-256: 02dc25c94ddb53478104418d66b8f4eb50758f125728dc3b3dee9a4e485d8cd0

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