Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ce19eef26cd9987…

MALICIOUS

PDF

74.2 KB Created: 2021-02-25 02:01:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 0ea9ccda620212409e9bed5e7ec9d643 SHA-1: 4e6f4b399f2b021139045a543a75b790db99682b SHA-256: 7ce19eef26cd99876211f6cbafd86bfaa6029abbf358735058cb236196f16241
184 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, appears to reference a teachers manual, suggesting a social engineering lure. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

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
  • 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://crophysi.ru/award?keyword=rccg+sunday+school+teachers+manual+10th+january+2021 In PDF document text
    • http://mafonofolifeda.22web.org/cheerleading_uniform_for_youth.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370740/normal_5fcb94ac68e6e.pdfIn PDF document text
    • http://bemixenorekuji.22web.org/venoratoli.pdfIn PDF document text
    • https://cdn.sqhk.co/zepipawetopi/iBgcRgd/kuvugaxubidarafubanabim.pdfIn PDF document text
    • https://cdn.sqhk.co/livefivepa/iaAgdV4/parent_appreciation_day_craft_ideas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421778/normal_600a49289e8df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374536/normal_6027e94823b32.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446944/normal_6000ae2a2849c.pdfIn PDF document text
    • https://cdn.sqhk.co/fifotadog/zhftQhg/telemedicine_stocks_usa.pdfIn PDF document text
    • http://zarabotok.space/social_studies_chapter_9_study_guidej1f8x.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/tikofaketonub/25923266842.pdfIn PDF document text
    • http://pitareri.rf.gd/describe_the_three_estates_of_france.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/nesosetigosubutixe.pdfIn PDF document text
    • http://sunotewisutexo.epizy.com/residadonufitaborir.pdfIn PDF document text
    • http://kazaxese.epizy.com/pufurozasoxo.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_off0000e492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE492 5864 bytes
SHA-256: f95bbe17c412fbe4b9913b617933bc47e7ca828fc4a7c141b8f2b98d063869ae
font_01_sfnt_off0000f871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF871 10360 bytes
SHA-256: a7bd53c5c1a459162aaae0db39162574e3157a2958d834b03e5b9a76ab98835e

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