Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec4323b4ab78307a…

MALICIOUS

PDF

76.5 KB Created: 2021-03-03 06:48:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: cbd03eac74841cc2f41c726b8ebd1bb1 SHA-1: 71f0581879452d8459d310c348e17323828f7365 SHA-256: ec4323b4ab78307ae498bd00e6e941b41c91b84ab786167bf8a7e2f3ce66a6da
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, appears to contain keywords related to technical issues ('Windows server 2012 r2 datacenter product key not working'), suggesting a lure to trick users into clicking the malicious link. The presence of multiple disposable hosting links further supports a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=windows+server+2012+r2+datacenter+product+key+not+working In PDF document text
    • https://cdn.sqhk.co/gebemiwisero/cii8mMM/genimeziwonako.pdfIn PDF document text
    • https://panejukirid.weebly.com/uploads/1/3/1/6/131606092/4b4d6d.pdfIn PDF document text
    • https://solovetimu.weebly.com/uploads/1/3/4/8/134879252/jutuxad-gotatobepitana.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450876/normal_5fe0ce0175735.pdfIn PDF document text
    • http://vutaturubodud.22web.org/pirates_of_the_caribbean_piano_notes_easy.pdfIn PDF document text
    • http://policyhelpcenter.com/annie_script_freefj55a.pdfIn PDF document text
    • https://cdn.sqhk.co/wazafanez/ifBjfec/exercises_to_bowl_faster_in_cricket.pdfIn PDF document text
    • http://ukranews.site/coxal_bone_anatomy_worksheet5itg8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466398/normal_601cb2afb7441.pdfIn PDF document text
    • https://zajefogana.weebly.com/uploads/1/3/1/4/131407312/zaselepos.pdfIn PDF document text
    • http://shopee24.site/icu_handoff_report_sheetqwqxl.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/dYrzyif/50165536604.pdfIn PDF document text
    • http://damita.fun/stihl_ms180c_parts_breakdownl208n.pdfIn PDF document text
    • https://situzofunuk.weebly.com/uploads/1/3/5/3/135305293/1532262.pdfIn PDF document text
    • http://lordtrans.ru/geometry_cheat_sheet12na4.pdfIn PDF document text
    • https://cdn.sqhk.co/filomada/1gjjfgi/zojazefu.pdfIn PDF document text
    • https://rinavotonig.weebly.com/uploads/1/3/4/4/134477757/4423598.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483349/normal_6027286ef0b0b.pdfIn PDF document text
    • https://nudatisuwirok.weebly.com/uploads/1/3/1/3/131384101/fitigazefo.pdfIn PDF document text
    • https://xexetuva.weebly.com/uploads/1/3/4/5/134599875/zadepegi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vudajerex.rf.gd/dubakelorijajejoz.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_off0000eb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9A 5868 bytes
SHA-256: d9480f3693971c4235de4a055256782286b358840f8d523b7c0807eafa8b8a5a
font_01_sfnt_off0000ffd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD0 10720 bytes
SHA-256: 894973ddc829b56b28b5eb4cc2db041d30ccfa8d81cb4e0de1140e5b499d851e

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