Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0dec8306ee99bc5…

MALICIOUS

PDF

85.7 KB Created: 2021-04-13 01:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4e1b3913576b6f04f7ed8950f8b9c6b5 SHA-1: fb79dde83982b3a341144ca7f02fe1ea4318f5a7 SHA-256: b0dec8306ee99bc5cbe40bd37a10da70a9ac84341d281090cf411b81759c623b
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed for SEO manipulation or phishing. The document body is heavily obfuscated but contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically. The presence of numerous external URIs and the ML classifier's high confidence score strongly suggest malicious intent, likely related to phishing or scamming operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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
  • 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://dugedepap.ru/strik?utm_term=speed+queen+stackable+washer+and+dryer+dimensions PDF link annotation
    • https://cdn.sqhk.co/feneradebeza/jjcZuha/43999205963.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417664/normal_601fc9dcec47a.pdfIn PDF document text
    • https://nojasiputijaze.weebly.com/uploads/1/3/4/8/134869787/dikenadepo.pdfIn PDF document text
    • https://jefaganogebe.weebly.com/uploads/1/3/1/4/131437435/jisifitawib-vevenal.pdfIn PDF document text
    • https://vuzidupujesezo.weebly.com/uploads/1/3/1/3/131398219/7a684d48b6.pdfIn PDF document text
    • https://cdn.sqhk.co/zamokaxu/lzSlify/dinos_online_mod_free_download.pdfIn PDF document text
    • https://nugobobunebiset.weebly.com/uploads/1/3/5/3/135303429/nenovusukegegiv.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/jeRhiJC/messenger_download_for_chromebook.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416316/normal_6039ba9a64d9b.pdfIn PDF document text
    • https://cdn.sqhk.co/xolokenuw/ihYWjbQ/horse_kick_pro_review.pdfIn PDF document text
    • https://pogosarixuxa.weebly.com/uploads/1/3/0/7/130776079/tebosale.pdfIn PDF document text
    • https://cdn.sqhk.co/verexumifo/jb1g6ic/kusawixupuxedewaxavop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/pumebifoji.pdfIn PDF document text
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_21dc0ad6a1824997a08f398bbe8bb3c8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/wakiwanifinugererabuk.pdfIn PDF document text
    • https://ef733714-782c-48ea-8991-1bc0bf0c95f2.filesusr.com/ugd/ad2ade_c7e45bc25c264975a998a3556f388e72.pdf?index=trueIn PDF document text
    • https://53f03ce6-db0b-4f41-9bfc-6956ba41e1f4.filesusr.com/ugd/727e0f_c80251bb57b34cf2a266f44a884e19c5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/48674498945.pdfIn PDF document text
    • https://8c1dc56a-a131-4b43-acff-3635b9115217.filesusr.com/ugd/90423f_392b665025504a53b7af941e57fc7018.pdf?index=trueIn PDF document text
    • https://5e9816b5-e261-4a84-a5c7-594b6999e1c8.filesusr.com/ugd/eb2f7d_9c92edec8ddb40d4a2c7e11588f4d46c.pdf?index=trueIn PDF document text
    • https://d0aee4dd-c5bf-4c29-adcf-3aa844f59ef3.filesusr.com/ugd/193d13_079afd8e726c4974b92f967305f222df.pdf?index=trueIn PDF document text
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_0393fe6f21f64323a802b2d59405cb57.pdf?index=trueIn PDF document text
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_b536d91fb1784fb7985150ba875552ac.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/towakog/pathfinder_cleric_build_guide.pdfIn PDF document text
    • https://d427386d-3434-45d9-8802-370857a594f4.filesusr.com/ugd/accd1f_b5fc9783075a4e49b569fb589d4b2700.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/godewumazek/cymera_para_pc.pdfIn PDF document text
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_1c8c86658e7c42c7b4c85e66b519c4c7.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_off00010b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7D 5940 bytes
SHA-256: f695738ac5e609235843b658bc21a441d85bcdec4bb7710c778a8a4830a0d599
font_01_sfnt_off00011fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA2 12152 bytes
SHA-256: d27e834f94f6cec169ca65bc61dc7562b9c8a39e2d12cd12a1a876b1d8eadb32

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