Malicious PDF — malware analysis report

Static analysis result for SHA-256 52b1f5527ef1e1e6…

MALICIOUS

PDF

81.7 KB Created: 2021-04-14 19:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: e42e2145656e0786723e28ac58bb65f1 SHA-1: e7a6e5e4c91a933680eb0f41eab92476a7227ff1 SHA-256: 52b1f5527ef1e1e6d231667e00705c3d6375200868821f4ed9ff073e2fd6348c
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a significant number of external links, many pointing to disposable hosting, indicating a link farm or SEO abuse tactic. The document body, though heavily obfuscated, contains references to 'Dental anesthesiology salary canada' and 'wkhtmltopdf', suggesting a lure to attract users interested in specific search terms. The primary malicious activity appears to be redirecting users to external URLs, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://pelibifir.ru/strik?utm_term=dental+anesthesiology+salary+canada PDF link annotation
    • http://lorem.space/get_out_of_debt_plan_worksheettrlcs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488090/normal_5fe5df2521cd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447098/normal_605419a414943.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451555/normal_5ff0045651f34.pdfIn PDF document text
    • http://vertitribe.store/910562440740r2uh.pdfIn PDF document text
    • http://agentsecure.space/fuverulofajirakupakizefewzoqp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367312/normal_600b7493768ec.pdfIn PDF document text
    • http://callup.today/xotedigebur1zenm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374189/normal_603d450f7bdb6.pdfIn PDF document text
    • http://morj.space/tidonosileveladimu96i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482848/normal_601df7a38894e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381081/normal_604b99b60bdde.pdfIn PDF document text
    • http://gonaxepafa.iblogger.org/best_viewer_linux_reddit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366009/normal_6014209abcb20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490722/normal_60141f86e80be.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://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_02b9745f4c684ed2a2d24f0385281ec5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd1c346f-ef71-4a7b-8834-ca59da730259/dimogexadanivatumewiwopu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5f4c287-14be-4b77-8daf-2082d276a726/weber_spirit_ii_e_210_flavorizer_bars.pdfIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_96afa7f0021d4c078ee5a85245b5ea83.pdf?index=trueIn PDF document text
    • http://wozawexopad.epizy.com/dell_latitude_7290_data_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72251f1a-3033-4160-93d9-d16bc34419da/toro_wheel_horse_8-25_belt_diagram.pdfIn PDF document text
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_d7c106f441e847b68e4a1c770325d2da.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BC 5088 bytes
SHA-256: be7a18134b3da51643de7fbd10a5ad0422d2f472aac2dc9e0373bb6fcc0b98ac
font_01_sfnt_off00010605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10605 10804 bytes
SHA-256: ec044f32da8f671dcd084c765da3f3f9cedfdad8a4eee9a73dd7f7e032fb6869
font_02_sfnt_off00012b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B14 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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