Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a78cd8179395d3…

MALICIOUS

PDF

70.1 KB Created: 2020-11-25 11:47:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: e41cffbb26d314c6ba878424649ca9ec SHA-1: b8ba3b30ef3c136b06f28b855210dd6012543545 SHA-256: f3a78cd8179395d3e3e3ed4636dbf34a7e8b9423da8e7ad621c7e9e7aca878cd
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. Another heuristic indicates a large number of external PDF links, suggesting a link farm. While the document body is heavily obfuscated, the presence of these links and the ClamAV detection strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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?utm_term=hammerwatch+puzzle+guide In PDF document text
    • https://vufavinit.weebly.com/uploads/1/3/4/6/134649981/sufegidiba_woranujopulu_fojesizurux.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/dd8d140f-e085-4dae-9f41-031a79b436f1/dinosaur_train_einiosaurus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eab7df5d-c512-4ad0-91ad-b10ebb30ac08/zirejakigititezemun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/459ee29a-0cb8-40ae-a938-abdc3c1d3ec8/68970360478.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/vujifinefekonugaseralazow.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/vixex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eed25f7c-ee7b-4111-8c9e-a1a14f5edb6e/pastors_wedding_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1b43b7b-4db5-4ad6-9e73-066e11d50c5f/nise_control_systems_engineering_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/baixar_livros_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0eac551d-b7aa-4a3f-99c4-f51b6a23014f/vadofukijisiwekebuboduves.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/295d9c2a-b439-44fe-bce0-887b1dd4c03a/cub_scout_bear_requirements_baloo_the_builder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07dc2d21-f562-44dd-96e5-d0b93b270b69/femifib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/183c910f-fd4b-4345-9e42-deb001460424/16486236930.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed4e0a20-b2b8-4453-84ad-ea2ec6a36f05/bepojipodevur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d46ce32e-4800-4fe3-b691-481054d4e322/siverogivadumixawozepun.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_off0000d5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D6 5412 bytes
SHA-256: 702d7cce67aa093eb0fadd33e0cfd6015362b6e7a7a3562c7af64582699ff675
font_01_sfnt_off0000e82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82D 10484 bytes
SHA-256: d6b87d4642d430d1bad6de13a93e3692ba6fdc410499ada16ce76a6159848098

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