Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a44529c3d5a3a19…

MALICIOUS

PDF

72.6 KB Created: 2021-03-04 19:49:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 8d01a597a98b654c807758f719735f29 SHA-1: 7d073a96258d7c2fa058a6897125b98ebac9d072 SHA-256: 4a44529c3d5a3a19a39d2411b6814de0a3f9454d42518d8fb36651eb8aa2aec6
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a large number of embedded URLs, many of which point to disposable hosting and are likely used to redirect users to malicious sites for malware downloads. The presence of external URIs and a link farm heuristic further supports this attack pattern.

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 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://gimoguvi.ru/strik?utm_term=lesco+50+lb+spreader+assembly PDF link annotation
    • http://akfb.online/wefizokaxuloredinebh6z3n.pdfIn PDF document text
    • http://hookup666.site/871254944608nfcc.pdfIn PDF document text
    • http://dotasif.iblogger.org/academic_poster_design_template.pdfIn PDF document text
    • http://kuxni.su/873945008679i2uu.pdfIn PDF document text
    • http://propovar.ru/sigowirifopukiburonesak6xd2f.pdfIn PDF document text
    • https://jekodijup.weebly.com/uploads/1/3/4/4/134490718/863ea.pdfIn PDF document text
    • http://ayazshabutdinov.club/28241314835z8fgy.pdfIn PDF document text
    • http://beruvutekimeged.22web.org/frankie_and_bennys_dinner_menu_nutritional_information.pdfIn PDF document text
    • https://suzoniku.weebly.com/uploads/1/3/4/4/134456843/5962937.pdfIn PDF document text
    • https://nevitasez.weebly.com/uploads/1/3/4/3/134305442/4179744.pdfIn PDF document text
    • http://sellforce.ru/pride_and_prejudice_1995_tv_series_watch_onlinenxxx0.pdfIn PDF document text
    • https://buwuwewofopalun.weebly.com/uploads/1/3/4/0/134097592/a792dc.pdfIn PDF document text
    • http://wewedaz.iblogger.org/do_movado_watches_increase_in_value.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://puwegobatove.epizy.com/anatomy_and_physiology_book_in_hindi.pdfIn PDF document text
    • http://pevajaxujob.epizy.com/gutolexejapexal.pdfIn PDF document text
    • https://0eaabcdb-938a-45a6-85a3-1a7d796bbcdd.filesusr.com/ugd/8d6d25_38076a142f7f41ed9ec168e92946f8ec.pdf?index=trueIn PDF document text
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_41998e494288420f80c1ac4510fff1a9.pdf?index=trueIn PDF document text
    • http://sotixavar.epizy.com/zumadelep.pdfIn PDF document text
    • http://xibogowidam.epizy.com/77533671974.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_off0000d12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12E 5220 bytes
SHA-256: 74b317cf1c8f0ee0137ab0508ae2a7f96dffc99f9b227f006808c1bac69fb854
font_01_sfnt_off0000e2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E6 10596 bytes
SHA-256: b579eb10b09b787774177322d0b1f1302ac8de3c079e273ca349deab8ae04d6d
font_02_sfnt_off000106f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F8 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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