Malicious PDF — malware analysis report

Static analysis result for SHA-256 8536d0e596ec67b9…

MALICIOUS

PDF

86.6 KB Created: 2021-04-05 22:34:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 7ac222c04443e5c681990aa93d6b2dff SHA-1: 802ac81e58cd1c6cadfcbacda53957b6f4b4aeaa SHA-256: 8536d0e596ec67b9808e45a706bcd8302ef9081b4e9a7f657db49f5f50cf6988
126 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm on disposable hosting. The embedded URLs and the document's metadata suggest it is designed to trick users into downloading further malicious content, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and heuristics point towards a malicious intent to redirect users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://mezovuduw.ru/award?keyword=matrimonial+biodata+format+pdf+download PDF link annotation
    • http://megahit.space/how_to_use_singer_3337_sewing_machinepu1cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386080/normal_5fce957b4bdcc.pdfIn PDF document text
    • https://saletenabij.weebly.com/uploads/1/3/4/3/134339554/6368056.pdfIn PDF document text
    • http://cocobeautybar.ca/suretunodiwipapodexuruallf5.pdfIn PDF document text
    • https://takaranedo.weebly.com/uploads/1/3/4/0/134017801/bewipaxewo.pdfIn PDF document text
    • http://vipmanmarket.space/restless_heart_bluest_eyes_in_texas_lyricsmdnrb.pdfIn PDF document text
    • http://uscovidcharts.com/vusurewhp0jy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408995/normal_6052c705bd1b4.pdfIn PDF document text
    • https://kobetuditi.weebly.com/uploads/1/3/4/4/134446504/migopis-dubaxepepajiwa.pdfIn PDF document text
    • https://bobazuforabi.weebly.com/uploads/1/3/1/4/131452976/5952416.pdfIn PDF document text
    • http://profer-opt.ru/critical_thinking_skills_developing_effective_analysisry0db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501486/normal_5fdc1db8c5ad9.pdfIn PDF document text
    • http://delaem-sami.online/devunadf59ly.pdfIn PDF document text
    • http://hurleyshamburgers.com/los_simpson_capitulos_completos_en_espaol_latino_20184nafa.pdfIn PDF document text
    • http://naturmilans.fun/8177642893948ug6.pdfIn PDF document text
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/cef53466.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422906/normal_5ff8ed712055a.pdfIn PDF document text
    • http://bu-markett.com/wafegowiripifuxerunetivof1nd4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485309/normal_6051406814f87.pdfIn PDF document text
    • http://lienforkid.com/balloon_tower_defense_6_free_apkb0s67.pdfIn PDF document text
    • http://rankingcoach-apps.com/zifisomanoxebuwijilf2mdp.pdfIn PDF document text
    • http://kilijosizujowo.medianewsonline.com/curse_of_strahd_reloaded_amber_temple.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vawivulumekil.onlinewebshop.net/92143569475.pdfIn PDF document text
    • http://bekusisit.atwebpages.com/zibojazawikomife.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_off00011596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11596 5244 bytes
SHA-256: 49358417061e73bea1c0779d4a0cc9fd28ed4c2265ec07953b0a351e5274e9bd
font_01_sfnt_off0001276e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276E 10968 bytes
SHA-256: 8ea767465ea07e69029cc6dce05526fbe5c07a8ee63053a60175875472c1275d