Malicious PDF — malware analysis report

Static analysis result for SHA-256 37e126aade92662d…

MALICIOUS

PDF

42.2 KB Created: 2020-04-04 09:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: a644f7e892b7d355310cf31fc126a1ad SHA-1: 93889f5c8057d9edbff1eea2a18631783a3c502a SHA-256: 37e126aade92662d10ec3971d5604a34663cacfd46fcaa365e0e7b6d7c5e64b8
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, a technique often used for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness. The primary attack pattern involves directing users to a farm of external PDF URLs, with the first identified URL being http://kelbels.org/uploads/1/3/1/4/131453602/131453602.html#instrumento+utilizado+para+medir+la+presion+sanguinea.

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://kelbels.org/uploads/1/3/1/4/131453602/131453602.html#instrumento+utilizado+para+medir+la+presion+sanguinea PDF link annotation
    • http://avtechessentials.com/uploads/1/3/0/6/130604787/df04a81166b3188.pdfIn PDF document text
    • http://nusensations.net/uploads/1/3/0/3/130379121/juwulawewaxoxin.pdfIn PDF document text
    • http://georgiamccusker.com/uploads/1/3/0/7/130739333/sirobu.pdfIn PDF document text
    • http://healinspireconnect.com/uploads/1/3/1/0/131070718/b6748d6ec61933d.pdfIn PDF document text
    • http://artisticlighting.net/uploads/1/3/0/7/130738964/2c03d08927deb58.pdfIn PDF document text
    • http://motitaweb.org/uploads/1/3/1/4/131484268/2521759.pdfIn PDF document text
    • http://dynamiteseafood.com/uploads/1/3/0/5/130590555/mokejorekudak_gelifimebi_domax.pdfIn PDF document text
    • http://mobileinstallationgroup.com/uploads/1/3/0/7/130775388/zepopiresutijuponeza.pdfIn PDF document text
    • http://amazonaskitchen.com/uploads/1/3/0/5/130550715/c871a387384.pdfIn PDF document text
    • http://ftp.rosebudelectric.com/uploads/1/3/0/5/130588502/956514073.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_off00007b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B2A 8392 bytes
SHA-256: f4b0d5f19bc1ffbeed9a5a77d1543d18147473058a5962d4431dc4589f3577af

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