Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea3d44030eb906f9…

MALICIOUS

PDF

103.2 KB Created: 2021-04-03 21:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 17c23f6162583703f7890da724449d4b SHA-1: 7927a3df8e5882ae55d44530f68205218a5bb595 SHA-256: ea3d44030eb906f9cfe128f7bc2459ba0962d629593aa2b9cc563729fdd9e6c6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution attempt. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF is designed to host many links on potentially untrusted hosting, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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 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://golowaki.ru/strik?utm_term=diferentes+tipos+de+grupos+etnicos+en+mexico PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4480402/normal_5feee6140ac71.pdfIn PDF document text
    • http://100p-f.ru/nezibuzw634.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501380/normal_6027d7273e172.pdfIn PDF document text
    • http://kuvonej.iblogger.org/airway_manual_jeppesen.pdfIn PDF document text
    • http://instapriz.site/how_to_fix_a_pressure_washer_hose_leak47ksi.pdfIn PDF document text
    • https://bomexufimewaw.weebly.com/uploads/1/3/4/5/134517434/bukapefonujariwore.pdfIn PDF document text
    • http://jushq.club/72653467404h86dd.pdfIn PDF document text
    • https://telixezudaridif.weebly.com/uploads/1/3/0/7/130775339/fuxonexilijiwudopi.pdfIn PDF document text
    • https://roxomikanu.weebly.com/uploads/1/3/0/8/130873860/7960f4afafa7b.pdfIn PDF document text
    • http://apeech.ru/48710189883mitih.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471081/normal_6060b465e6484.pdfIn PDF document text
    • https://ritojajugub.weebly.com/uploads/1/3/5/9/135984917/porafimi-gisatomepejil-dufajifofi-womoferij.pdfIn PDF document text
    • http://0fruits.space/67884238730kwsoi.pdfIn PDF document text
    • https://mokazeke.weebly.com/uploads/1/3/1/3/131384082/redowirutarubunu.pdfIn PDF document text
    • http://ighelpcenter.xyz/linksys_ac_1200_wi-fi_extender6uyz8.pdfIn PDF document text
    • http://vopibuxipem.22web.org/the_ratchet_line_dance.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424024/normal_5fcd11f13da86.pdfIn PDF document text
    • http://cucoupon.info/lista_de_verbos_irregulares_conjugados_en_espaolxxnl5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499002/normal_60679247352a2.pdfIn PDF document text
    • https://podinelejuwe.weebly.com/uploads/1/3/2/7/132710627/geximenezimu_jefab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rowesotinik.rf.gd/amplitude_modulation_tutorial.pdfIn PDF document text
    • http://nulesade.epizy.com/biophysical_techniques_iain_campbell.pdfIn PDF document text
    • http://niwuzowebod.epizy.com/how_to_make_money_as_a_beginner_programmer.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_off00015278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15278 5300 bytes
SHA-256: b70bc113436c79c36f54707337f0042c6171697fa055b64632bf846e7e58220b
font_01_sfnt_off0001647d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1647D 12752 bytes
SHA-256: 0dcb8618d5a30c0cad008390fdc6e68cb2678ab67fbfa7ef2ef69f8172967df5

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