Malicious PDF — malware analysis report

Static analysis result for SHA-256 5098d47151e2f462…

MALICIOUS

PDF

39.0 KB Created: 2020-10-25 19:14:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 0ed49267d98393e60cb2505faec595e8 SHA-1: 7c539dffb89ac0b5691509638c73f18532d01bf5 SHA-256: 5098d47151e2f462dc50492cec3d7035b4f702e5499d92b2a1dc2b74eb7ebe2e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file functions as a link farm, containing numerous embedded URLs designed to redirect users to external websites. One prominent URL, 'https://ggtraff.ru/aws?keyword=calcutta+university+migration+form+2017+pdf', is flagged as a malicious redirector. The document's structure and the high number of links suggest an attempt to manipulate search engine results or distribute malicious content through deceptive means.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ggtraff.ru/aws?keyword=calcutta+university+migration+form+2017+pdf In PDF document text
    • https://mefemanodi.weebly.com/uploads/1/3/1/4/131454269/ffdcf71395daab5.pdfIn PDF document text
    • https://ligetivegivug.weebly.com/uploads/1/3/4/0/134041815/8682544.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/3946401.pdfIn PDF document text
    • https://siveruvamavekug.weebly.com/uploads/1/3/4/2/134266289/5eab1003.pdfIn PDF document text
    • https://kafaziwe.weebly.com/uploads/1/3/1/0/131070109/gesulakajepepubas.pdfIn PDF document text
    • https://guxitubekin.weebly.com/uploads/1/3/4/2/134267073/sakujunemi_korepafuma_kefavime.pdfIn PDF document text
    • https://jupisururixed.weebly.com/uploads/1/3/4/3/134339091/ce81365c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366369/normal_5f8b982d17524.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365646/normal_5f87b32c1b896.pdfIn PDF document text
    • https://faworufobideped.weebly.com/uploads/1/3/2/6/132682851/kulosox.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/6120656.pdfIn PDF document text
    • https://disavapiviloma.weebly.com/uploads/1/3/4/3/134351159/6414213.pdfIn PDF document text
    • https://lefedatit.weebly.com/uploads/1/3/0/7/130776734/sagexepad-zaxiruwej-gilata-kolita.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1aed0b3-d476-4771-825b-d562983d3e5f/nifisimilisenag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74e2d555-6119-40d7-96c7-2d9b5625b303/50283245590.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c60eca9-0eb7-4e2c-a033-2a1524ccba26/fejodaxeverusetev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eeff4d09-8f04-406b-9067-2b265462d00a/chrissy_teigen_cookbook.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/35853266701.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/dawisowiluzokezejo.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/kawezodiwinesozipebabetol.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5726 5948 bytes
SHA-256: f555fec621da0d6d367f03cc639461a50ee365ca63a2dd4e04ef5b4063d4d276
font_01_sfnt_off00006b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B6D 10252 bytes
SHA-256: 103ddff5796d1647a824720f3fea6c72b381e7c30dea5cc2934ffb82ab3d5710

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