Malicious PDF — malware analysis report

Static analysis result for SHA-256 269801ab4a5f3785…

MALICIOUS

PDF

79.7 KB Created: 2021-03-18 06:28:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: fdc1f6bc07f8cb41c351804b14b52ad6 SHA-1: de3ece42c2fca0fb5c0a451ffee968cab35b45e3 SHA-256: 269801ab4a5f37851345dbce1cd957f1948a0a00f6b1d55782e34da70621c328
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 at least one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to 'sccm pediatric sepsis guidelines', suggesting a lure to trick users into clicking the malicious links.

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/123?utm_term=sccm+pediatric+sepsis+guidelines In PDF document text
    • http://sezituza.66ghz.com/ranijitux.pdfIn PDF document text
    • http://walolexokesufa.sportsontheweb.net/is_m5_faster_than_m3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449629/normal_6032a9db97b0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476288/normal_5fd2a8a325c53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487197/normal_601423ba41837.pdfIn PDF document text
    • http://mibajisokawetu.iblogger.org/37275295617.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/how_to_respond_to_a_good_review_at_work.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zitolejix.rf.gd/12104814714.pdfIn PDF document text
    • https://f05e0dbb-21cf-40ea-8b71-00b8d6f49a3b.filesusr.com/ugd/b09e1d_e98349eecaf345d1b1049c4e2786b91d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/whirlpool_cabrio_washer_troubleshooting_codes.pdfIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_53fb3f207a30423a96ff125e030ca4fb.pdf?index=trueIn PDF document text
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_0e96cf8cee994a45a9428286feeaaec1.pdf?index=trueIn PDF document text
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_3bd8412cf50d4dc19e08fd7cd46da4fb.pdf?index=trueIn PDF document text
    • http://rimataruzo.epizy.com/tosirosim.pdfIn PDF document text
    • http://kivevufawonin.rf.gd/alberta_bill_of_sale_vehicle_form.pdfIn PDF document text
    • http://gosiribe.epizy.com/tutorial_adobe_premiere_pro_bahasa_indonesia.pdfIn PDF document text
    • http://nulitapa.rf.gd/2375763880.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/manhattan_subway_map_2019.pdfIn PDF document text
    • https://d497f082-4895-42de-a72c-038d9367c8a3.filesusr.com/ugd/8e727b_0627cbd4cdaf4b2e80d28ee34c64716b.pdf?index=trueIn 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_off0000f977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF977 5496 bytes
SHA-256: b12dc25bdeb9db544619e3b45626e4e74acf05093e350b47aa0ac98566bc3ea5
font_01_sfnt_off00010c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0C 11004 bytes
SHA-256: a37bb872e6c61a79beb10b7215f5138248ee6f1505b0f484c65f0ba1dffafb41

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