Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0cc5492bdc7ac23…

MALICIOUS

PDF

91.7 KB Created: 2021-06-07 09:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d4ba85ac4129e0db690419b71dad6594 SHA-1: 7681f35e5567af201dc92b5cda3a2ba8858a5198 SHA-256: b0cc5492bdc7ac23eea2077c0c5b6a97750c61b8325d5cd73b9fbc9fcaebc7c4
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to disposable hosting services, indicating a link farm designed to distribute traffic to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

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://queure.ru/pbw?utm_term=what+does+napoleon%2527s+name+symbolize+in+animal+farm PDF link annotation
    • https://sojugadetoju.weebly.com/uploads/1/3/4/6/134683069/855abcc59d96c.pdfIn PDF document text
    • https://tirokaroxere.weebly.com/uploads/1/3/2/7/132740449/9eaa3b8b82.pdfIn PDF document text
    • https://xasopivuzag.weebly.com/uploads/1/3/5/3/135333163/3687516.pdfIn PDF document text
    • https://kozitasulama.weebly.com/uploads/1/3/4/6/134647404/5665165.pdfIn PDF document text
    • https://tojalebume.weebly.com/uploads/1/3/4/6/134603773/2d057a2f685.pdfIn PDF document text
    • https://kigazapaxulet.weebly.com/uploads/1/3/0/7/130774964/9738366.pdfIn PDF document text
    • https://fiwibafufo.weebly.com/uploads/1/3/0/7/130774969/da6af7b8.pdfIn PDF document text
    • https://kepudeveru.weebly.com/uploads/1/3/4/6/134698703/sewem.pdfIn PDF document text
    • https://waxebusesu.weebly.com/uploads/1/3/4/7/134770319/415cff.pdfIn PDF document text
    • https://mokaredoraxo.weebly.com/uploads/1/3/4/0/134095924/buwuripiw-gupokorototazuv.pdfIn PDF document text
    • https://bikepudebap.weebly.com/uploads/1/3/1/4/131405977/4825608.pdfIn PDF document text
    • https://tepaxomiro.weebly.com/uploads/1/3/6/0/136019937/6d5e30f.pdfIn PDF document text
    • https://wemowojek.weebly.com/uploads/1/3/5/9/135993501/3817661.pdfIn PDF document text
    • https://lujisitezolip.weebly.com/uploads/1/3/4/1/134109273/runobopowete_mafefibivegetu.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/8d8120f2-b295-4951-9417-efd8a7da5d3a/fekomijuginotizakukeni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80f4d4fb-6a26-46f3-9938-a4f1b857c013/kabigopitepuxawuranuveg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eab0c346-e60f-478e-9004-d3c326c687fa/tem_como_saber_quem_visualizou_meu_vdeo_no_instagram.pdfIn PDF document text
    • http://mupalunava.pbworks.com/w/file/fetch/144674325/visusilulerigak.pdfIn PDF document text
    • http://pokuwatosat.pbworks.com/f/gizenewamupe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22d50dfe-82f4-4238-be84-64446a88537b/kung_fu_panda_4_full_movie_free_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7be7dd11-c804-4ebb-be68-c8a59cd6f11c/sufukaxiboruseragosuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e53a84c-752d-40be-b9c1-32cf26646198/65712191077.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b31b1640-6b1b-4551-9d5f-6f586bf3a57c/what_does_junior_mean_in_shoe_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/344dceb9-3c45-4352-8fd9-c84dcb7a31c3/tetisovetelil.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_off00012907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12907 5620 bytes
SHA-256: bc12169d4aed9256d9f0be6b5092fda315d13dd9dbcd4d0f871fc702f825077e
font_01_sfnt_off00013c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C1B 10904 bytes
SHA-256: 042f68d426e633774feb1b9d359bba40b86d011d40dfa1c44ff81787e7251c97

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