Malicious PDF — malware analysis report

Static analysis result for SHA-256 f250660c06eaa5a6…

MALICIOUS

PDF

80.7 KB Created: 2021-02-24 13:49:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: cc5be5c9b07749c310b86550085d91be SHA-1: 4b7ad0fd2a524eac9a5e7962c3734d11954162b4 SHA-256: f250660c06eaa5a669a5bce8c484a4a39d95d94a62bd241069f5d4d22458cc0f
154 Risk Score

Malware Insights

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

The PDF contains embedded URLs that point to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to a phishing site or download further malware. No scripts were extracted, but the presence of malicious links is sufficient evidence of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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://crophysi.ru/strik?utm_term=qualities+of+good+public+speakers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4484380/normal_600a5dce52c6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456686/normal_6029530d04f49.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377663/normal_5ff033c2cf30b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366014/normal_5fd79cd2b9c6a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459481/normal_5ff6a6810c532.pdfIn PDF document text
    • http://you-bestshop.xyz/5294455840jv1qo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462374/normal_60257b931ffd7.pdfIn PDF document text
    • http://ukrinsure.com/78534490470dycyi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464710/normal_5ffbe794800c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502511/normal_600f89e7e7ea5.pdfIn PDF document text
    • http://itash.space/space_engineers_pertamj83w7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428069/normal_5fe735c498b65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394082/normal_600de14ce28e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407552/normal_6008c89f0aa88.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480170/normal_5fede4382464e.pdfIn PDF document text
    • http://giocodigital.website/rinnai_hot_water_system_manualdszxm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477623/normal_6007bd702af90.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486552/normal_5ffa31777c277.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
    • https://s3.amazonaws.com/sinadi/51000208683.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/aankh_marey_song_3gp.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_off0000f093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF093 5364 bytes
SHA-256: f5fa1079e34574f25f2d70ad6ebb96309cdbff8961b75f2a47b79ef95b7561a1
font_01_sfnt_off000102e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E1 10560 bytes
SHA-256: 3b4bd1486b77b2af7f6c7510c381cb3900b868d8d6fb40b6233c681b80b8bb16
font_02_sfnt_off00012708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12708 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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