Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0ff76786eb805a3…

MALICIOUS

PDF

81.2 KB Created: 2021-03-27 14:03:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 013d4a71e7f63cbed2b103bac9742cb3 SHA-1: f8dcfac3f50b045f6dccea63ba89585d975a3cd2 SHA-256: c0ff76786eb805a372b6648fb1a11822939e5f5e4dd1cf18624c8bc1c426a436
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, including one to 'pelibifir.ru', suggesting an attempt to drive traffic or potentially phish users. The document body, though heavily obfuscated, appears to contain keywords related to 'radioactive waste disposal' and 'wkhtmltopdf', indicating a lure for search engine optimization or deceptive content. No scripts were extracted, but the presence of multiple external links points towards a phishing or SEO manipulation attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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/award?keyword=radioactive+waste+disposal+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4426972/normal_600361d7d4c26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416501/normal_60242f9d028d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393628/normal_5ff417e77779a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449992/normal_603b700d0e1bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478387/normal_601e609b10fe4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469643/normal_60253b897c0a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492871/normal_6035d8ed83894.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476427/normal_60567ab69b1d1.pdfIn PDF document text
    • http://montana-media.com/htc_one_m8_charging_jacka8bag.pdfIn PDF document text
    • http://poopo.ru/mobasufapeszb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416500/normal_5ffcd372da2a5.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://c78ffd2e-fc3d-4272-86ca-968d835fb7ad.filesusr.com/ugd/0f9ef0_eea71350fa374e9897aaf0c016058765.pdf?index=trueIn PDF document text
    • https://5e024257-ca51-40df-b6b5-a3104c7b7124.filesusr.com/ugd/97368a_4b5b7432943b466caf723e39882fc868.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/43cd6852-c14a-473e-9719-40de5de34396/descargar_el_cigarrillo_de_ana_gabriel_en_mp3teca.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34471fbb-6d02-45c4-82cc-6c850c2ee888/pisilixixuperejo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70c2ec1f-9b10-4e09-a861-dc906025b7e0/pearl_whirlpool_tub_repair.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee52ccf9-8f7d-470d-a23f-a0b5ef3eada9/zefosawalumukiremet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c236381-e019-46f4-b5a7-da85247a52ce/labox.pdfIn PDF document text
    • https://db38eef3-7d65-43a4-badd-ba39ed7d9417.filesusr.com/ugd/bd2483_bd1a3e41db63467f93e1f9182c0c9283.pdf?index=trueIn PDF document text
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_284e9732262b47dcb74d3ac3f1600785.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7919f78-d19d-4219-8fac-6a2655206cb9/the_end_lemony_snicket_audiobook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e511c123-b166-4698-a013-c5be7e94917f/defixobowufibo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21323386-bcd9-4f7c-bba6-625d7065b08b/u.s._army_combatives_field_manual_fm_21-150.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF487 4896 bytes
SHA-256: f476d6997750789d47ed8634278fde28c1fc57710e459bbf4c4f11958bff5f95
font_01_sfnt_off0001055d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055D 10516 bytes
SHA-256: 09baff550774ca71cf9a09fe593d53630ecf01cba00abb2e85a779d307d5c18a
font_02_sfnt_off0001294d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294D 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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