Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ee4efd80233a71…

MALICIOUS

PDF

79.7 KB Created: 2021-03-27 14:34:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e6f9892a01cdfe4971bbde7a1f31d436 SHA-1: 99db4d62f80d39053b6e9d0bb52555e447ed5c6c SHA-256: 38ee4efd80233a715b71e20b513f7327b0701a5f50c55218b65460eec93c94c0
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many pointing to disposable domains and redirectors, suggesting a link farm designed to distribute malicious content or phish users. The document body, though heavily obfuscated, appears to be a lure related to interview questions. The presence of a malicious redirector URL and ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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.
  • 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=how+to+answer+who+are+you+question+in+an+interview In PDF document text
    • https://cdn.sqhk.co/linerutinew/Ejhb1GY/all_star_smash_mouth_drum_tab.pdfIn PDF document text
    • https://cdn.sqhk.co/zumedizojas/fkgchh0/tilukadotepelo.pdfIn PDF document text
    • https://kogekotosejikol.weebly.com/uploads/1/3/5/4/135400664/bifokexi.pdfIn PDF document text
    • https://cdn.sqhk.co/bawusipa/iehcJhf/98563993814.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/nnvKwgh/music_mp3_player_app.pdfIn PDF document text
    • https://cdn.sqhk.co/pelotuwew/7jgegeU/9767772146.pdfIn PDF document text
    • http://francobusiness.com/2084991970oiww4.pdfIn PDF document text
    • http://4gusevshop.website/top_body_menu_fichierovcij.pdfIn PDF document text
    • http://topcreditreport.info/sosowerijibibalokiritexmvmbe.pdfIn PDF document text
    • https://cdn.sqhk.co/narobalof/jhaYcgf/28995957176.pdfIn PDF document text
    • http://netewe5.xyz/gosupedafisiwisatujorcxp5g.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://excellent-spb.ru/gibujevipirivarrdih.pdfIn PDF document text
    • http://instasavephoto.com/multiple_intelligences_theory_explains_that_not_everyone_is_book_smartp4z80.pdfIn PDF document text
    • http://tikovg.xyz/jerisagojevobadaloxagotiy5wua.pdfIn PDF document text
    • https://pagurewitapusak.weebly.com/uploads/1/3/4/6/134632053/bonibafegas-kokulimujex-lalipasirivav-bugag.pdfIn PDF document text
    • https://cdn.sqhk.co/manigonodapu/jgggjvH/vilezinow.pdfIn PDF document text
    • https://narosixepitifon.weebly.com/uploads/1/3/5/9/135960882/1679141.pdfIn PDF document text
    • https://nerisowale.weebly.com/uploads/1/3/1/4/131412290/guviwan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ede8a7a3-2377-4e09-926a-401222b31c25.filesusr.com/ugd/81c89d_f1eba46df68946fdac3f83e342402775.pdf?index=trueIn PDF document text
    • https://ebed6276-6372-4ddf-adad-9a0fa504b99f.filesusr.com/ugd/805d2a_343d0fe4c1484fe0973fe46ac587d6d3.pdf?index=trueIn PDF document text
    • https://8ed7ad90-0d0e-491f-9c15-1f6cd5a61d18.filesusr.com/ugd/f1a804_95d1068156fc4f0cbe6b76337d3e0e89.pdf?index=trueIn PDF document text
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_854fe9be962547b5a0d18517bc386727.pdf?index=trueIn PDF document text
    • https://466f9527-ada3-48b4-ac0c-4ba5546996ca.filesusr.com/ugd/a4b6b9_47f707c2743c463089fc2290f04d677b.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF4 5084 bytes
SHA-256: 33a63b6d80d1c3aaefbaeddae0cafbbdaeff72737a87dda00936faa3969f54e4
font_01_sfnt_off00010e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E55 10544 bytes
SHA-256: 220d1ca7d0a2a894ee6a4834f909f87d11fb3f425c002572a326a87b45d33582

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