Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ef61810881da5b…

MALICIOUS

PDF

56.1 KB Created: 2020-03-30 10:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 9cd49de970eb120c3ba010cc71ada478 SHA-1: 575e7ed4a3078c793b96df8d2eb10df229e04d90 SHA-256: 83ef61810881da5b14bdb80fadfa591afcff2e3ef3497d3abc16973657f7ed6f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to other PDF files with numeric slugs, indicating a potential link farm or distribution mechanism. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous external URLs suggests an attempt to redirect the user to malicious content or facilitate SEO manipulation.

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://webdisk.collegedemsatiu.com/uploads/1/3/1/0/131069806/131069806.html#lista+de+cotejo+segun+autores+2010 PDF link annotation
    • http://zrphotography.org/uploads/1/3/0/4/130435524/vitel.pdfIn PDF document text
    • http://rcbuildmod.com/uploads/1/3/0/7/130740148/0d7105556182.pdfIn PDF document text
    • http://zayinsolutions.com/uploads/1/3/0/8/130874510/3f0b389.pdfIn PDF document text
    • http://kivelyoffice.net/uploads/1/3/0/3/130323423/8614228.pdfIn PDF document text
    • http://danfitts.com/uploads/1/3/0/4/130476471/2739d117aa0ed.pdfIn PDF document text
    • http://stridestronger.com/uploads/1/3/0/8/130813851/1372528.pdfIn PDF document text
    • http://studio450.com/uploads/1/3/0/6/130604061/fegonuwuz.pdfIn PDF document text
    • http://realestatecareerhampsteadnc.com/uploads/1/3/0/6/130604919/9364775.pdfIn PDF document text
    • http://www.cafeklatsch-ueffeln.de/uploads/1/3/0/6/130620431/093c6.pdfIn PDF document text
    • http://pchelpnsupport.com/uploads/1/3/0/5/130588839/6b3b42.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 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_off0000afbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFBB 10028 bytes
SHA-256: 56ce5c17031036185bc8ab7d6a446ac9e88ada3ac50e0bd97ed1da68c59fcc21

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