Malicious PDF — malware analysis report

Static analysis result for SHA-256 447c9dfa5aa83c95…

MALICIOUS

PDF

81.4 KB Created: 2020-11-21 07:42:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 6cb10ca0c846b30dd905ac5793794d19 SHA-1: 1d5d75825e3e93657395cc6708d1a2bfba1db43b SHA-256: 447c9dfa5aa83c95d6f10ec8f3fe060bac980fab40c60a680b9de84ca770a145
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or malicious intent. It contains a large number of external links, many of which are likely part of a link farm designed to manipulate search engine results. One of the embedded URLs, 'https://trafficel.ru/123?utm_term=black+and+white+striped+blazer+mens', is suspicious and likely leads to a malicious resource.

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://trafficel.ru/123?utm_term=black+and+white+striped+blazer+mens PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425217/normal_5faec6cfae3ff.pdfIn PDF document text
    • https://galebekamabe.weebly.com/uploads/1/3/4/3/134305591/terakisitivazowesi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459623/normal_5fa93fe396ac9.pdfIn PDF document text
    • https://xovadesunuzavam.weebly.com/uploads/1/3/4/4/134479636/3926413.pdfIn PDF document text
    • https://jemexegotida.weebly.com/uploads/1/3/4/4/134464186/2129009.pdfIn PDF document text
    • https://rixilokif.weebly.com/uploads/1/3/4/1/134109141/duxixapezasozo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477139/normal_5fb29bc3152d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365536/normal_5fa6b799f208e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365662/normal_5f86f7abaad9d.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/77f57b89-41cd-46bc-96f2-c201183d0c85/laboratory_manual_introductory_chemistry_charles_h_corwin_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ecedac2-fa97-44aa-907f-77eb72fbc86c/history_bee_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/badodemebo/jose_de_egipto_capitulo_36_completo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b522e3e3-c29a-431b-bd72-a47e98dd07ac/which_greek_god_is_the_goddess_of_discord.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/julesadixetagobisav.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_off0000fc42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC42 5708 bytes
SHA-256: 4f527140d25f23eb173c7b9f3d7f0c0625c010acc1f36ebba5ef7f96f11c674c
font_01_sfnt_off00010f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F96 12848 bytes
SHA-256: 740e4c86c80516f233926d013015e298180aea166be007ec118b6b546b353c32

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