Malicious PDF — malware analysis report

Static analysis result for SHA-256 cec75f276a5130ef…

MALICIOUS

PDF

76.7 KB Created: 2021-02-17 18:40:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: bee88096dec1b3c024d431300917936f SHA-1: cba27d098a534e779957bb0006953af7ba17412e SHA-256: cec75f276a5130ef8d3576c8565d576dd0f0ded4158dcd622755f356c8c8076c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, strongly suggesting a phishing or malware distribution campaign. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/strik?utm_term=shadowrun+hong+kong+best+ranged+weapon PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4490739/normal_5fc7e5bf2d49f.pdfIn PDF document text
    • https://cdn.sqhk.co/tetaxekumipi/ggmHgcy/kizekavilarime.pdfIn PDF document text
    • https://cdn.sqhk.co/moxawitab/ibjbjbA/88010504251.pdfIn PDF document text
    • http://my-favshopf.online/81681510621j59hw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408873/normal_5ff4fa360bd0a.pdfIn PDF document text
    • http://copyright-help-center.com/19199855010xk5le.pdfIn PDF document text
    • http://vvinorama.fun/doubling_multiplication_strategy_worksheetswb2ev.pdfIn PDF document text
    • http://fevuworejefe.iblogger.org/spider-_man_2018_video_game_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366340/normal_5fd91f498dbd8.pdfIn PDF document text
    • https://cdn.sqhk.co/vibebexez/jggehie/mobile_data_turns_off_automatically.pdfIn PDF document text
    • https://cdn.sqhk.co/desogepupema/dhgjigv/interesting_things_you_didn_t_know.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4528959/normal_5ff36d39cddc1.pdfIn PDF document text
    • https://gumelajijepepa.weebly.com/uploads/1/3/4/6/134639918/4256f28a2896d5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/92694898985.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/support_vector_machine_tutorial.pdfIn PDF document text
    • http://todakule.rf.gd/89351600005.pdfIn PDF document text
    • http://wepexivir.epizy.com/fodafegatonekezitekum.pdfIn PDF document text
    • https://s3.amazonaws.com/lusegokaves/epic_browser_for_windows_8._1.pdfIn PDF document text
    • http://zotuxegusam.epizy.com/legal_assistant_cover_letter_template.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/dummy_s_guide_to_fantasy_football.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_off0000ed9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9C 5588 bytes
SHA-256: 354d77633a0e65813de2c6bcdcfe550f859d02176704fed62dfbe1d5794743c4
font_01_sfnt_off000100a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A3 10640 bytes
SHA-256: cc339f37d7fc9d6d5900543710530dfc3916b4244c2eb65abc8d40edabdbff50

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