Malicious PDF — malware analysis report

Static analysis result for SHA-256 27902041aed04a1f…

MALICIOUS

PDF

76.7 KB Created: 2021-03-27 22:13:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: adc99ff7afc5fe992d6d42001d111cfc SHA-1: 9300da11fbc3066998baf2da045247220c2b655f SHA-256: 27902041aed04a1faf654409206225879abfc9a2030ed93de03a27f5e36b05eb
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant portion pointing to disposable hosting and redirectors, indicating a link farm designed to obscure the final destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of URLs like 'https://resalured.ru/123' strongly suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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://resalured.ru/123?utm_term=radio+broadcasting+background+music+free PDF link annotation
    • http://mimawusavap.iblogger.org/ledamij.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/gjgfjib/40402141785.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464078/normal_5ffb2aa262602.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380859/normal_601adede5181e.pdfIn PDF document text
    • https://cdn.sqhk.co/viwedanej/jbjOlji/92865486384.pdfIn PDF document text
    • https://cdn.sqhk.co/bijukipuj/ljfhchg/pocket_arcade_virtual_racer.pdfIn PDF document text
    • https://cdn.sqhk.co/nogawevorus/GYVhihj/spongebob_sponge_on_the_run_netflix_release_date.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370286/normal_603311864669c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459025/normal_604219b9c9621.pdfIn PDF document text
    • https://cdn.sqhk.co/jarixizotib/byjanhc/majafukokibugabukeja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496193/normal_5fe79ddb525d9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c999f699-ae82-473e-9eb9-39e08b867c33/pafabula.pdfIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/bose_universal_remote_control_user_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae78b8b0-0545-45ee-8cb3-1cb8733c8f1a/3798959617.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/ethical_considerations_in_questionnaire_research.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d55a8c09-928b-4c1f-b0c5-3c6f134ea49b/34801520548.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/briggs_and_stratton_vanguard_23_hp_carburetor.pdfIn PDF document text
    • http://rekewam.rf.gd/how_much_do_managers_at_planet_fitness_make.pdfIn PDF document text
    • https://4eb3a9b5-ca6a-4b2a-896e-878abc754f3b.filesusr.com/ugd/f1ab86_27829eab81c04f79b05ee18d4d61ae84.pdf?index=trueIn PDF document text
    • http://fezipowivi.rf.gd/timestamp_format_cassandra.pdfIn PDF document text
    • https://91e55214-10ad-44cf-a10a-60a9392df58b.filesusr.com/ugd/e1c37d_412011c5d3a5429ab0cb5f28a0df06fa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/de157a83-c277-4d48-9fc9-01e7638acd9f/nelson_handwriting_worksheets_printable.pdfIn PDF document text
    • https://f39f7cea-6337-46de-af4f-699959e6db0a.filesusr.com/ugd/004672_92ae4043211243648ba20e2677945020.pdf?index=trueIn PDF document text
    • https://18e7ef82-5c75-44fe-ae22-4c356c2c9ce0.filesusr.com/ugd/749e61_f047cfab49e7497abd854ec54299fa5e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/17565215545.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_off0000edc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC9 5520 bytes
SHA-256: 01f639b3662f2b080a734d226adc57864700753165036ceb85afa8f81e97bcf9
font_01_sfnt_off00010082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10082 10948 bytes
SHA-256: 27a40dfaa0085ae1780f960fb1b0ff812b0b852a99529946bacb8aa40e74a8cf