Malicious PDF — malware analysis report

Static analysis result for SHA-256 14d7a5ba418c1315…

MALICIOUS

PDF

71.6 KB Created: 2020-11-24 18:05:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 47891bd75be2b1ea22ee5bfb262aee55 SHA-1: 9e358aeebd3464e37934918b2a0fefbec290876a SHA-256: 14d7a5ba418c1315d9a1ef4424432b2a114200c19b3a688e0f252e1cd7f780e7
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs hosted on S3 buckets, suggesting a link farm or SEO poisoning tactic. One of the primary URLs, trafftec.ru, is flagged as unknown, indicating a potential malicious destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

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
  • 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=kentucky+wonder+beans+wikipedia PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380405/normal_5fbb4e76a73a3.pdfIn PDF document text
    • https://lewanodeb.weebly.com/uploads/1/3/4/8/134885095/3108528.pdfIn PDF document text
    • https://jixobufasov.weebly.com/uploads/1/3/4/3/134324480/nijileb-manozevigi-xaladus.pdfIn PDF document text
    • https://jazaxalik.weebly.com/uploads/1/3/4/4/134488577/9143432.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fapaga/gawawekotosikom.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/chesterton_orthodoxy_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vasofirida/gnossienne_1_free_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/sodanizagigovos.pdfIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/autograph_full_movie_free_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/koligawilamomumitegode.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/minority_report_detailed_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/binomische_formeln_auflsen_rechner.pdfIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/monetary_and_fiscal_policy_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/dnd_5e_artificer.pdfIn PDF document text
    • https://s3.amazonaws.com/tofizo/mspy_mod_apk.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_off0000d611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD611 5404 bytes
SHA-256: a2d1de56306bfebe287ad5ae78531a69e53b46481e1ee10e703c170d183f1677
font_01_sfnt_off0000e896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE896 12008 bytes
SHA-256: 5ce01f3b218c75519f58534c315289e76438f9f4eb7b737c7d2ea567b64575e4

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