Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5c221a7af6694d5…

MALICIOUS

PDF

156.6 KB Created: 2021-03-10 05:54:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f6c50aa240ebc0c1ff1b712219964a62 SHA-1: 6abc2292b2ab5031e089cb62ed9348958e6fd856 SHA-256: a5c221a7af6694d5cd2ab0ece98dda66a71837d128a5495ee7d1f20e3d29d960
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious content. The presence of numerous external URIs, particularly the one at 'gimoguvi.ru', suggests a phishing or scam attempt disguised as a document about '3d cell culture pdf'. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://gimoguvi.ru/award?keyword=3d+cell+culture+pdf PDF link annotation
    • http://kirovafin.iblogger.org/production_of_honey_bee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414679/normal_6047129e16829.pdfIn PDF document text
    • http://lemowezubuje.22web.org/premiere_pro_free_download_for_windows_10.pdfIn PDF document text
    • https://rekinijibir.weebly.com/uploads/1/3/2/3/132302710/4851489.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386333/normal_5fd814781ef73.pdfIn PDF document text
    • http://pijubunoze.22web.org/battlefield_1_online_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409411/normal_6009eb43d3a70.pdfIn PDF document text
    • http://mezoterilijixa.22web.org/alfabeto_griego_historia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460473/normal_604158bf09ded.pdfIn PDF document text
    • https://dumuzuvo.weebly.com/uploads/1/3/4/6/134695275/4811231.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mafukifuwu.epizy.com/autogenes_training_8_formeln.pdfIn PDF document text
    • http://wobuwikag.epizy.com/rosugew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/745f6483-8d26-4b8c-b97f-0d5c3c5ea8c6/72983017920.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8a03147-aab5-4487-bf45-dac8618ff7c3/what_is_the_difference_between_32_and_64_bit_architecture.pdfIn PDF document text
    • http://posinumufupe.epizy.com/55697389257.pdfIn PDF document text
    • http://kevefadewa.epizy.com/1607261034.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4a1abfb-3458-4962-9d95-8a61820be303/93539118954.pdfIn PDF document text
    • http://foxadawimuwewar.epizy.com/pofenogemizug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36321b73-73ed-410f-8b04-39823ea75162/64524331103.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5131e973-84a9-41fb-8830-81aa44ab652c/mamikizuxaxaf.pdfIn PDF document text
    • http://sumafalonedap.rf.gd/backup_restore_android_without_root.pdfIn PDF document text
    • http://tagejenetel.rf.gd/95650724997.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_off00022f8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22F8A 4832 bytes
SHA-256: 5b85159c297eca0f3830a91a96171e0fbeacadf5c9859878fd700d26035130e1
font_01_sfnt_off0002400e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2400E 10720 bytes
SHA-256: 8fb36b5d97ebf67a1b11e3cc3862852757b31accfd88d1290b1b0f90918680b3

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