Malicious PDF — malware analysis report

Static analysis result for SHA-256 0120e3e0ac71af19…

MALICIOUS

PDF

65.8 KB Created: 2020-11-19 10:24:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: bc5e5a71930438d99a25640312fc10db SHA-1: 76bc9a13169a58dd455302f54841fec5d6206f01 SHA-256: 0120e3e0ac71af195067574ba23cd3347e340da87fffb694d5144f8a9033d69b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, with one pointing to 'trafftec.ru', suggesting a link farm or phishing attempt. The document's content, though heavily obfuscated, appears to be presented as a service manual to deceive users into clicking on these links, which likely lead to further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://trafftec.ru/123?utm_term=touareg+service+manual PDF link annotation
    • https://luwamagol.weebly.com/uploads/1/3/4/3/134375262/5252647.pdfIn PDF document text
    • https://roxunasof.weebly.com/uploads/1/3/4/3/134312726/tesafurapusoxeziniz.pdfIn PDF document text
    • https://tivubikujadilav.weebly.com/uploads/1/3/4/5/134527100/8c7272.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403414/normal_5fa725e97ccf5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391305/normal_5faac54b815bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402250/normal_5f91e81dae998.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/5b433704-1307-42be-9ea0-2855488bb95c/words_that_start_with_tum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d736ad08-2950-4401-b548-3640dfc8247d/bebuzotizamomudiwav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bd8a256-b970-4afe-b230-8c3b73747e59/23764796219.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3572e6ad-c2ea-4c86-832d-596ac841ba4b/97858651161.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cb2558b-4a9a-473f-9272-2f9262a3fc1b/modelo_de_redes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f92b5e3-f186-4ad4-a094-b638bdc2040f/java_se8_for_programmers_3rd_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0819cbf8-5005-4446-a64e-498a4f0bc4bc/39544891033.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_off0000c500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC500 5128 bytes
SHA-256: b104a28f7a5ec086ce87ac43cc465a10a0b0f18655e7ead851ea154c24c8837d
font_01_sfnt_off0000d666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD666 10824 bytes
SHA-256: 96be57e6655cc0448fe9e0cb3d5048cb5aa35af0c7a768d86418f4d5340db077

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