Malicious PDF — malware analysis report

Static analysis result for SHA-256 2948af7ad33f7bbd…

MALICIOUS

PDF

34.5 KB Created: 2020-06-14 21:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-07
MD5: 6332b62cfbde1f078b10db049918c01d SHA-1: 875b8ffdf2748af3e9b5b8e6532e0b41e138aa98 SHA-256: 2948af7ad33f7bbd0934972c10d621e68596fa5aebffc634b5ac5ab4a2e2b1cb
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO spam operation. The document body, though partially corrupted, contains text related to 'Art lesson for kids singapore' and references the wkhtmltopdf tool, which was likely used to generate the PDF. The primary malicious activity observed is the redirection to external URLs, such as http://74-123-77-52.mgwnet.com/uploads/1/3/0/2/130289482/130289482.html#art+lesson+for+kids+singapore, which are likely intended to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://74-123-77-52.mgwnet.com/uploads/1/3/0/2/130289482/130289482.html#art+lesson+for+kids+singapore PDF link annotation
    • http://southdownscomputing.com/uploads/1/3/1/4/131453127/numexikosimig.pdfIn PDF document text
    • http://paulfayeaassociates.com/uploads/1/3/1/8/131856903/9276432.pdfIn PDF document text
    • http://exoticstitches.com/uploads/1/3/0/5/130550873/2851202.pdfIn PDF document text
    • http://childreninleadership.org/uploads/1/3/1/4/131406784/kajutineximowik.pdfIn PDF document text
    • http://contacts.neuromama.com/uploads/1/3/0/6/130620587/8710648.pdfIn PDF document text
    • http://workspaceridge.com/uploads/1/3/0/6/130639892/7043d2289b04.pdfIn PDF document text
    • http://jobsight365.com/uploads/1/3/0/5/130588452/mitader-setuzi-sukapamoduji-pewuduwegedaked.pdfIn PDF document text
    • http://newenglandopportunityproject.org/uploads/1/3/0/5/130589310/nupugilijefinap.pdfIn PDF document text
    • http://findingmysparkle.org/uploads/1/3/1/3/131381003/femewuxujafikiz_visetizisiti.pdfIn PDF document text
    • http://cpanel.cabincreekfarmstudio.com/uploads/1/3/1/0/131070566/gadorusupomob_vebate_janejati.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://lutajuwez.files.wordpress.com/2020/06/nojewixiruro.pdfIn PDF document text
    • https://jarobodovilu465607016.files.wordpress.com/2020/06/debazakojox.pdfIn PDF document text
    • https://julaxotetelu73207895.files.wordpress.com/2020/06/77632528799.pdfIn PDF document text
    • https://binutizazal.files.wordpress.com/2020/06/90824420457.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
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

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_off00005c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C8F 10064 bytes
SHA-256: 3878a11a37c08441081929fabb456493ce0d0c3e5292fd9f1ea22c0045a35723

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