Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e874761e53cae37…

MALICIOUS

PDF

91.7 KB Created: 2020-12-29 18:13:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 79d5c917cfb3efb4073bf3ecb4b938a2 SHA-1: bea5790f4af0eae494705bafa751c0bbb6d7f4f7 SHA-256: 5e874761e53cae378abaed4323d2c8353c896bb58d716215b2662a0672b4311b
164 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 ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a large number of external links, including one to 'trafficel.ru', suggests a link farm or phishing attempt. The heuristic 'SE_URGENCY_LURE' indicates the document likely uses urgent language to prompt user interaction, a common tactic in phishing and malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=shadow+man+mega+man PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4367947/normal_5fc827347b0cb.pdfIn PDF document text
    • https://sikiroradimer.weebly.com/uploads/1/3/4/6/134619363/budoroxulivelus_vitatimukuv_kavunomekitilo_vumuvixi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384639/normal_5f923d38630e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392199/normal_5f9495a8495ff.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/bajapovogam/bangla_calligraphy_font.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/057d8b6f-e594-4513-967c-e142fee4c3e3/regulatory_sanctions_search.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c823fa0-ba28-47b7-9085-d1784b0d6439/pokemon_crystal_download_pokemoner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4089f544-17a3-464b-b2ad-4fe21ce4f75a/ultimate_to_do_list_trello.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4622e0c-1505-41bb-945b-87fbdceb7ee4/undeniable_madeline_sheehan_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61ec1fa5-e643-4a99-b227-5944916c2164/24725937235.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/exercice_anglais_5eme_present_simple_et_be_ing.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF391 17088 bytes
SHA-256: 0503057212a5e986bb5763b621cc20d7c2a46a8a5e65245c6f58a697f85797c4
font_01_sfnt_off00012882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12882 5128 bytes
SHA-256: b89eb8803a3aa9d7887df87de78241cb0282461b4bb5215d9ee39d9b617d9b06
font_02_sfnt_off000139e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E5 11792 bytes
SHA-256: a35b253d58682e88b414d9faa5f194b1c0fd19228a46119f818283f759923ecf

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