Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc0684e72d8ddf90…

MALICIOUS

PDF

79.8 KB Created: 2021-04-03 19:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 75744457b398f6690a4e65941a9e8ac3 SHA-1: 484d0f2956d5de6608e9f927e71037a9590ddeab SHA-256: bc0684e72d8ddf90f2f0daad3b03cea81d48052a6b96cba8daeb0763b7f7867d
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV 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 designed to redirect users to potentially malicious sites. The document body, though heavily obfuscated, appears to contain keywords related to product reviews, likely serving as a lure to disguise the malicious nature of the embedded links.

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.
  • 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://ponafet.ru/strik?utm_term=presto+11+inch+electric+skillet+reviews PDF link annotation
    • https://cdn.sqhk.co/gudopokobipa/6pjjPii/classlink_santa_rosa_login_launchpad.pdfIn PDF document text
    • http://fastcreditreport.info/lajepabhhg0s.pdfIn PDF document text
    • https://cdn.sqhk.co/zupitefa/jiS49gd/radiologist_assistant_salary_nj.pdfIn PDF document text
    • https://wufikasokuwomoz.weebly.com/uploads/1/3/4/3/134359410/jamelapemow.pdfIn PDF document text
    • https://lopazilavorelid.weebly.com/uploads/1/3/4/0/134097689/e632c16a2.pdfIn PDF document text
    • https://ratisatemapabuz.weebly.com/uploads/1/3/1/3/131398591/wofafoxanu.pdfIn PDF document text
    • https://cdn.sqhk.co/jisepozidis/icihieP/imo_video_call_free_download_for_iphone_6.pdfIn PDF document text
    • https://cdn.sqhk.co/lorotukogof/gi2cNua/delado.pdfIn PDF document text
    • http://shopmzm.site/ripizikapudetlfplw.pdfIn PDF document text
    • https://gagodizuw.weebly.com/uploads/1/3/5/9/135965264/nigokuxo.pdfIn PDF document text
    • https://nebunabimumebu.weebly.com/uploads/1/3/4/4/134480995/0571a5a6a219c6c.pdfIn PDF document text
    • http://3gusevshop.space/archeage_classes_guideqyoqw.pdfIn PDF document text
    • http://fumigatoff.online/96084931135mbawf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_8552d3dfb5224aa7ab29ee2d7e82c0a2.pdf?index=trueIn PDF document text
    • https://14e2190e-1c7c-401b-bdd1-4e50d95f8180.filesusr.com/ugd/62a579_19eac2e8e75349c887e8b72c218d5576.pdf?index=trueIn PDF document text
    • https://6f12065f-c45d-410c-b048-6ec23fb2b810.filesusr.com/ugd/02ccf7_1ef5bf032a104183ba7822710f475724.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3922d332-ba5e-45cb-90a9-65bcd7670c12/how_to_cleanse_scalp_naturally.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5da247e-ab02-4afb-8d19-e13c143d74b2/lumanasojesokefekivod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/928f98a2-b7f3-4537-96ec-00745dfa447b/honeywell_visionpro_4000_programmable_thermostat.pdfIn PDF document text
    • https://e62d90d9-845b-491d-b9b1-804d55ccd6e6.filesusr.com/ugd/6af1ed_832a2cf65064430689f8dff9ea1a8148.pdf?index=trueIn PDF document text
    • https://8c17aa34-c454-4d6c-a218-8929c845e329.filesusr.com/ugd/808cd0_dbdec0416b2d4af0b8bd178079eeb5c3.pdf?index=trueIn PDF document text
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_088232b4df164cc18e721506faa1dff6.pdf?index=trueIn 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_off0000faee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEE 4944 bytes
SHA-256: 38d541ae2c978171c61219314d3bd8b7edc5d12ddd9e9e393f26a2ba3636b3ed
font_01_sfnt_off00010bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD7 11316 bytes
SHA-256: 971a4731bdcf643aa00624902bfbcba8749399a3e4280e4145bcedeae4c58ec0