Malicious PDF — malware analysis report

Static analysis result for SHA-256 b682f85c8c17c800…

MALICIOUS

PDF

83.1 KB Created: 2021-05-30 18:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c53c7615a79803e0266b567ddb54dde0 SHA-1: 27e14628623ef3b8495211aa7863f0e13e209a86 SHA-256: b682f85c8c17c80088d1ce49ba395c491f23236eef883b509ca916810942ef74
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spamming operation. The primary URL, 'https://fokemale.ru/strik?utm_term=how+are+toxins+classified', is presented as a classification of toxins, likely a lure to drive traffic. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://fokemale.ru/strik?utm_term=how+are+toxins+classified PDF link annotation
    • https://pugufewosanagut.weebly.com/uploads/1/3/4/3/134331363/rikis-xotibumuvokekon-mesozolor-suzatipu.pdfIn PDF document text
    • https://nebofubegifeso.weebly.com/uploads/1/3/1/4/131437549/wazixoweguruw.pdfIn PDF document text
    • https://domuzowejiro.weebly.com/uploads/1/3/4/3/134360268/fufogugesep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416136/normal_60567814dc359.pdfIn PDF document text
    • https://talonira.weebly.com/uploads/1/3/4/8/134895983/1329836.pdfIn PDF document text
    • https://vojufutevale.weebly.com/uploads/1/3/4/5/134521456/tajamodobev.pdfIn PDF document text
    • https://suzazega.weebly.com/uploads/1/3/4/4/134476369/jesokenod_satunavakuw_norum_mokopakibake.pdfIn PDF document text
    • https://javowutimor.weebly.com/uploads/1/3/4/0/134016661/getodo_tesesufipurudi_rabigajawavuwep_pexapik.pdfIn PDF document text
    • https://bimevaxufozuz.weebly.com/uploads/1/3/2/6/132683359/716b9f.pdfIn PDF document text
    • https://gidorimafemona.weebly.com/uploads/1/3/4/8/134867851/92182.pdfIn PDF document text
    • https://palotuzumi.weebly.com/uploads/1/3/5/9/135991270/8738147.pdfIn PDF document text
    • https://xawefiku.weebly.com/uploads/1/3/4/7/134753490/papune_wibezonera.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443598/normal_601cf8a80ad9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374682/normal_6025b6431ac18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407664/normal_601fd8c7cc9fc.pdfIn PDF document text
    • https://rupuleda.weebly.com/uploads/1/3/6/0/136002844/julawojokusoto_moguvi_tewiz.pdfIn PDF document text
    • https://nazizuvadonilu.weebly.com/uploads/1/3/4/5/134590702/kuguwefalagesemenuj.pdfIn PDF document text
    • https://tefitosuwit.weebly.com/uploads/1/3/4/4/134478986/2fe5da.pdfIn PDF document text
    • https://rapozudomemixu.weebly.com/uploads/1/3/5/3/135330029/4512447.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465131/normal_5ffd7ad08109c.pdfIn PDF document text
    • https://wugarusuxota.weebly.com/uploads/1/3/0/8/130814120/e7a2a5a.pdfIn PDF document text
    • https://rosanuwafurix.weebly.com/uploads/1/3/4/7/134766820/3553126.pdfIn PDF document text
    • https://toxavikosas.weebly.com/uploads/1/3/4/4/134437834/896af81be9c40f3.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/6190c128-b94a-4a5f-8ab0-0ea45e5c41af/canon_mg3120_ink_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef079739-e65b-4a42-aa4f-dbf1dab20c0a/34453886670.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/932a0abc-036e-48f9-9282-fd575538f7da/foundations_and_best_practices_in_early_childhood_education_3rd_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90f60efc-9521-4d08-91f1-fdc3c954fe4d/cross_section_drawings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/693ac278-5f20-43b3-a97b-c1bb1a968219/strength_of_materials_4th_edition_fl.singer.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_off000105cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CC 5136 bytes
SHA-256: bb72ab9801a52cf82098061d7517a1f24e05bb2d48a21490d5e3851d59316428
font_01_sfnt_off00011766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11766 11576 bytes
SHA-256: efba214c423a377691f624f947f5c1572da477009fdabfd1a0ae6209200e0797

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