Malicious PDF — malware analysis report

Static analysis result for SHA-256 4341f8cdafd80129…

MALICIOUS

PDF

77.0 KB Created: 2021-02-28 09:29:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5df0b430ff52b41434b95d69d1995a50 SHA-1: 8a0060178c847bee19d041a439f77f2ba618f55a SHA-256: 4341f8cdafd80129ca55817b002983e743a59c36315d8f6da17c1398edc65e77
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The ML classifier also flagged the PDF with high confidence. While no scripts were extracted, the presence of malicious links suggests an attempt to redirect users to phishing or malware hosting sites.

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/strik?utm_term=canticle+of+the+turning+wikipedia In PDF document text
    • https://static.s123-cdn-static.com/uploads/4488806/normal_5ffd702abc489.pdfIn PDF document text
    • https://cdn.sqhk.co/penavagalo/ejeIIFI/king_follower_and_likes_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387040/normal_5ffa3a206ea7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468553/normal_5fe66c938ba80.pdfIn PDF document text
    • https://figapizezedop.weebly.com/uploads/1/3/4/3/134364787/b7b81ce3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368485/normal_602c2f6384f27.pdfIn PDF document text
    • https://cdn.sqhk.co/mutexeze/hhCK5Qd/famous_telugu_movie_ringtones_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zotenejek/bjcnhhf/nugiduzegozo.pdfIn PDF document text
    • https://vibufimibe.weebly.com/uploads/1/3/0/7/130738819/nufor.pdfIn PDF document text
    • https://cdn.sqhk.co/rovifatira/ihJgibb/loona_odd_eye_circle_mix_match_download.pdfIn PDF document text
    • http://zonizubiro.getenjoyment.net/michigan_common_core_standards_1st_grade_math.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415526/normal_5fecc9f4e5d70.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/kexamoxusinixu/obituary_template_google_docs.pdfIn PDF document text
    • http://sisufovofow.atwebpages.com/17875409931.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/2638627909.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/92298589638.pdfIn PDF document text
    • http://womawujun.atwebpages.com/97658445127.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B0 5300 bytes
SHA-256: 1678b49467029d1e4934ad7f264a7a52f946024523b40e5b6eae9c04ddb849f6
font_01_sfnt_off000102c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C3 10948 bytes
SHA-256: 075a6e99aa833fa5c98db0f9a7b40dbeac422fd6ed6340b9c897b40e6a81d346

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