Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd3dfa44a8a66d20…

MALICIOUS

PDF

45.3 KB Created: 2020-10-30 14:43:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 2e6a2227ceb643a5135a9f8769647b2f SHA-1: 1238aeaa60ae3eaf609ef91d35bef582cbe14054 SHA-256: cd3dfa44a8a66d20c9046c72b308c5d3444a679e1398828a096c967b872ab19f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with the primary one identified as a malicious redirector. The document body, though partially corrupted, suggests a lure related to a 'school medical certificate template'. The ML classifier strongly indicated maliciousness, and the presence of a link farm further supports a malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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 https://gettraff.ru/aws?keyword=formato+de+certificado+medico+escolar+word In PDF document text
    • https://vufevilasok.weebly.com/uploads/1/3/4/3/134314299/surofajafasile.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390643/normal_5f904ea1ac63d.pdfIn PDF document text
    • https://denasigetul.weebly.com/uploads/1/3/4/3/134332190/600166.pdfIn PDF document text
    • https://rosikotukixaru.weebly.com/uploads/1/3/4/3/134312973/bowejupasiguxujumozo.pdfIn PDF document text
    • https://relogeseji.weebly.com/uploads/1/3/0/7/130739887/vipufupujexusop_tovazusebep_wavatavixujuv_zoluvutumeb.pdfIn PDF document text
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/benorex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391001/normal_5f8e53a38f0c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366341/normal_5f8869cf73284.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/liwafo/xosesomujixavuwajitubuwap.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/rimepuzawedabijofumezepo.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/datiligosukobesokarenewo.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/2652905629.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000643f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x643F 4896 bytes
SHA-256: 80e8b7497cf56ddc5fda8371c4f9670edfcddfb6054eeeb9be38f97d04b78312
font_01_sfnt_off000074f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74F2 10876 bytes
SHA-256: 330c9c1b3cce56c571e6ea98941663e16e3f5c0f66630f5df3c515e908627cdd
font_02_sfnt_off00009832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9832 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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