Malicious PDF — malware analysis report

Static analysis result for SHA-256 c33902a5cbc35442…

MALICIOUS

PDF

50.6 KB Created: 2020-04-09 09:15:42 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-08-25
MD5: 9c4a3ec10afae1cf09cf30d8ecb62e5a SHA-1: a0790109249b92f6c569a104e74a1cb1cfe777fc SHA-256: c33902a5cbc354423906adc35ea0b717eb4362be2f97e731ce872aa0666aadca
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or SEO abuse tactic. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to some of these URLs, suggesting an attempt to direct users to this network of sites. The primary goal appears to be driving traffic to these external resources, which could be used for various malicious purposes.

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://audaciatutoring.com/uploads/1/3/0/6/130604465/130604465.html#significado+de+la+palabra+histeria+diccionario PDF link annotation
    • http://anotaryonthemove.com/uploads/1/3/0/4/130483902/pogamadupuf.pdfIn PDF document text
    • http://lofofood.net/uploads/1/3/1/1/131163776/6874690.pdfIn PDF document text
    • http://savingthehungry.ca/uploads/1/3/0/6/130621214/nijaselurelofe.pdfIn PDF document text
    • http://gcconsulting.biz/uploads/1/3/0/4/130478433/juguwemid_lezizuje_jivuvaje.pdfIn PDF document text
    • http://volunticity.com/uploads/1/3/1/3/131380992/gazere-temimegemirow.pdfIn PDF document text
    • http://revolvingclosetclothingco.com/uploads/1/3/1/3/131379280/gopidebilunasonad.pdfIn PDF document text
    • http://michelleantus.com/uploads/1/3/0/6/130639143/kinowezabidesimola.pdfIn PDF document text
    • http://jackedup4jesus.com/uploads/1/3/0/9/130969874/8749492.pdfIn PDF document text
    • http://normworth1startist.com/uploads/1/3/0/6/130605497/fivomerikedud_nawixu_kedes.pdfIn PDF document text
    • http://villalobosconstruction.com/uploads/1/3/0/4/130488975/c6356511a71.pdfIn PDF document text
    • http://homecarebusinessacademy.com/uploads/1/3/0/2/130274269/5623109.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000079e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79E4 9944 bytes
SHA-256: 0ebb6f8543713b57bc9e1b4e27cbf6ae64f3e595561bdcc5a5333bb53bda044b
font_01_sfnt_off00009c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C07 2768 bytes
SHA-256: 11eff0542ee112a7a4f3d5fa86892f13f7f7c80edb17354215cea33bb7714487
font_02_sfnt_off0000a5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA5D1 16096 bytes
SHA-256: ff8fb627f3d0dd9997bbf5f8e67d75ba984810f76280c6dead7bf9ae512bf231

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