Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d072822159c4c5…

MALICIOUS

PDF

74.3 KB Created: 2021-01-13 19:30:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 674c1d135cfd7362e626d09d84e13e87 SHA-1: ee7eea21aa9cef014eb6e7d502914b11a206d6f6 SHA-256: b4d072822159c4c55a60318094afde93f162a12b18fb5c8b4a334d87ca62997c
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The embedded URLs likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=dynamics+worksheet+grade+4 PDF link annotation
    • https://site-1180242.mozfiles.com/files/1180242/dragon_ball_legends_twitter_friendship.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390637/normal_5fbf345025b7b.pdfIn PDF document text
    • https://site-1175796.mozfiles.com/files/1175796/damage_car_crash_engine_apk_download.pdfIn PDF document text
    • https://sibanomo.weebly.com/uploads/1/3/0/9/130969588/5125069.pdfIn PDF document text
    • https://naxufubiromu.weebly.com/uploads/1/3/0/7/130738890/begikowelemimin.pdfIn PDF document text
    • https://site-1176236.mozfiles.com/files/1176236/dinosewabipovesugotewigap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388169/normal_5fbf4906dca5d.pdfIn PDF document text
    • https://site-1175994.mozfiles.com/files/1175994/campus_date_sim_hack.pdfIn PDF document text
    • https://pewarefat.weebly.com/uploads/1/3/4/3/134361746/folugarovof-ruzareku-tabot-fafobasodiraped.pdfIn PDF document text
    • https://site-1180908.mozfiles.com/files/1180908/kutogut.pdfIn PDF document text
    • https://jonurimexiv.weebly.com/uploads/1/3/4/3/134321783/1500740.pdfIn PDF document text
    • https://site-1177705.mozfiles.com/files/1177705/imb_annual_reports_2016.pdfIn PDF document text
    • https://site-1173168.mozfiles.com/files/1173168/the_maze_runner_book_series_amazon.pdfIn PDF document text
    • https://cdn.sqhk.co/nupegefozub/fhgiaf9/earl_of_sandwich_disney_springs_closing.pdfIn PDF document text
    • https://ranitezal.weebly.com/uploads/1/3/1/4/131438109/15d71532.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EF 5668 bytes
SHA-256: 2f5ae462c3bb24485785b51f667d58ec54cf5cf3466a4a6db74c4dcc9b079da3
font_01_sfnt_off0000f639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF639 11124 bytes
SHA-256: 73e552290dbdbe8967ab4000382733428a6560010b8683bed6133785351f5209

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