Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3e345d887fa1508…

MALICIOUS

PDF

41.2 KB Created: 2020-11-08 04:40:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: dc9119726fa4074836b17ca757f6f124 SHA-1: 76c38c766621bfd7c3b82d966b9fecbb9cc41165 SHA-256: a3e345d887fa15085c54c8b6a8f8543efc3ebf4e542c7eec6eefa0466e0274ff
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. One prominent URL, 'https://traffking.ru/123?keyword=wavebird+controller+shell', is flagged as suspicious. The ML classifier strongly indicated maliciousness, and the structure suggests it's designed to drive traffic to potentially malicious or deceptive sites.

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://traffking.ru/123?keyword=wavebird+controller+shell PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366664/normal_5f9bdd008f32c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365584/normal_5f90d302b0290.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://nunuzeru.files.wordpress.com/2020/11/74077157358.pdfIn PDF document text
    • https://zegimok.files.wordpress.com/2020/11/20742094186.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b837d87b-dee3-4991-88be-6316f17844e9/tesutodopapezubonavo.pdfIn PDF document text
    • https://kututel.files.wordpress.com/2020/11/gotewogefipufedula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2ab4ffd-145b-4db3-99a0-cba73b009804/tenegemanoboxofezasif.pdfIn PDF document text
    • https://wobonil.files.wordpress.com/2020/11/82358340584.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb622011-88d2-4e78-9655-06d4c8f94d54/90474422016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b87c994d-5599-4ebc-957e-76b17d283a53/17818361600.pdfIn PDF document text
    • https://suvarofora.files.wordpress.com/2020/11/95519257918.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67cde167-92d7-444b-9e25-f5fab505de00/depogu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9218ee50-425e-4257-a71b-78617b547466/gas_production_in_a_chemical_reaction.pdfIn PDF document text
    • https://tefijum.files.wordpress.com/2020/11/fisigogakisev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11c49869-cc14-4447-8250-3a2757dc11e2/2004_acura_tl_repair_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_off000061e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61E9 5240 bytes
SHA-256: a78924f503c2df83a9b8c6d890a711aad8aa3e25232c391e9a01a6ca30005649
font_01_sfnt_off000073bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73BF 10804 bytes
SHA-256: 92026b76049bda16f02529629b57e199d08b6d69ba9199a9541b168ae94d2592

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