Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac8c43bdce30c790…

MALICIOUS

PDF

34.1 KB Created: 2020-03-16 15:21:51 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2026-05-08
MD5: 940fab9d117b47179c225c42d38f47bc SHA-1: 6feff291bf2450a4af87f9e13cf38bef51e6a41b SHA-256: ac8c43bdce30c790cb0b7cc26619354096573337fb9f993e3b24b24db4772c55
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or SEO manipulation tactic. The primary lure appears to be educational material, as indicated by the document body mentioning 'Libro de informatica'. The file's purpose is likely to drive traffic to these external sites, which may host further malicious content or phishing pages.

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://hardy2.pleasingfood.com/uploads/1/3/0/7/130739897/130739897.html#libro+de+informatica+2+cobach+baja+california PDF link annotation
    • http://clickpayrent.com/uploads/1/3/0/7/130775172/603568.pdfIn PDF document text
    • http://www.pennsmanorareametz.com/uploads/1/3/0/4/130436307/1578927.pdfIn PDF document text
    • http://manzanitasplayschools.org/uploads/1/3/0/5/130543874/14117.pdfIn PDF document text
    • http://webmail.theshapesmithbrisbane.com/uploads/1/3/0/2/130288462/8039744.pdfIn PDF document text
    • http://practicaaudaz.com/uploads/1/3/0/5/130588349/2013814.pdfIn PDF document text
    • http://www.khoneycutt.com/uploads/1/3/0/6/130620490/tupifa-judopeve-xopapib-lukaxukabi.pdfIn PDF document text
    • http://ns1.artsquarterbooks.com/uploads/1/3/0/2/130274301/patini_fepiwarumujuvow.pdfIn PDF document text
    • http://www.omdoggies.com/uploads/1/3/0/6/130621061/xuwemiwim.pdfIn PDF document text
    • http://emilymullikindesign.com/uploads/1/3/0/5/130540683/retubibupodexuxepe.pdfIn PDF document text
    • http://natashanatraj.com/uploads/1/3/0/6/130604317/8232664.pdfIn PDF document text
    • http://www.skinnova.es/uploads/1/3/1/1/131163832/leriwepo_tomuvafaliv.pdfIn PDF document text
    • http://basecamp-branding.com/uploads/1/3/0/7/130740338/zenevokozewa.pdfIn PDF document text
    • http://tartministries.net/uploads/1/3/0/8/130874326/a9dbb0dabbc.pdfIn PDF document text
    • http://grownetics.com/uploads/1/3/0/9/130969279/9446515.pdfIn PDF document text
    • http://www.hawaiiislandwedding.com/uploads/1/3/0/6/130604627/3249ae.pdfIn PDF document text
    • http://engine40.goteamonline.com/uploads/1/3/0/6/130639456/labaj.pdfIn PDF document text
    • http://sunnydrycleaners94116.com/uploads/1/3/0/5/130538922/bugowag.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_off00005b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B4B 8048 bytes
SHA-256: 7b67da89f25477977490da164c408769abaec3110eeb4e0cd6e97ab4781c3b8a

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