Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b0d8d0cda9ff5b0…

MALICIOUS

PDF

52.4 KB Created: 2020-11-08 16:08:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: bb3fdc158cc6febb6b59138c18e74339 SHA-1: d9c9c3c4663db970e511e5b996561296888ca1ac SHA-256: 4b0d8d0cda9ff5b0f0a91d7e2e329e326a3909cc960b0c919df757bea5fcbb4a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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 https://traffset.ru/123?keyword=diary+of+a+wimpy+kid+double+down+summary PDF link annotation
    • https://ritobawen.weebly.com/uploads/1/3/4/4/134486043/9014099.pdfIn PDF document text
    • https://nowusunomotir.weebly.com/uploads/1/3/4/3/134314498/fawomejepisivojuw.pdfIn PDF document text
    • https://morizuni.weebly.com/uploads/1/3/4/6/134606759/loxenubi-tivad.pdfIn PDF document text
    • https://kokejegifuro.weebly.com/uploads/1/3/4/4/134477846/wejigal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bepuvetu.files.wordpress.com/2020/11/92124626903.pdfIn PDF document text
    • https://kigokivaj.files.wordpress.com/2020/11/41238771732.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c84d6339-0134-40c5-88eb-06e72795e340/27572627507.pdfIn PDF document text
    • https://pukatof.files.wordpress.com/2020/11/39837047302.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ab23f29-aa88-468b-a786-52f6be344171/kara_kpr_narlktr_indir.pdfIn PDF document text
    • https://zidudadeg565145698.files.wordpress.com/2020/11/prentice_mulford_thoughts_are_things.pdfIn PDF document text
    • https://nevosaxovib.files.wordpress.com/2020/11/fizimobaruweboratiweti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98f7e509-00e3-4afc-8b70-49859ca621cb/debozotulowiwuzubituza.pdfIn PDF document text
    • https://nusazepiroj.files.wordpress.com/2020/11/hayward_sp2303vsp_maxflo_vs_manual.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_off00008cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CF6 5584 bytes
SHA-256: f76275cb78837620d164bdb4cc61c5d187c03bb82045e36fdb8bfff4113b9dc1
font_01_sfnt_off00009ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9FFD 10580 bytes
SHA-256: 189c5b620b3901cbe7812f52fb11c9ce0d6cdb621168dff06a02122be1d49b57

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