Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b7f507fabe08f3a…

MALICIOUS

PDF

80.6 KB Created: 2021-05-21 20:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1938b60ad680f4bc41e59f3ebc150e2a SHA-1: c24292d539d6adf7daf3eca5059db46a59c87a0f SHA-256: 5b7f507fabe08f3a23a39cde977f6a98e8e7017afd37523f115620bb5b7b21c7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains like weebly.com, indicating a link farm designed to redirect users. The presence of a URL with a 'strik' path and a 'perfil de los 5 lenguajes del amor test' query parameter suggests a phishing or scam attempt. ClamAV and ML classifiers also flagged this PDF as malicious, supporting the assessment of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/strik?utm_term=perfil+de+los+5+lenguajes+del+amor+test PDF link annotation
    • https://weruvuwixaxo.weebly.com/uploads/1/3/5/9/135972833/6897805.pdfIn PDF document text
    • https://bazojosazim.weebly.com/uploads/1/3/6/0/136086377/9af3c.pdfIn PDF document text
    • https://nenomoxemobare.weebly.com/uploads/1/3/6/0/136010140/poxifutezekup.pdfIn PDF document text
    • https://bosonelete.weebly.com/uploads/1/3/0/8/130873804/6679747.pdfIn PDF document text
    • https://wojegapemepuwa.weebly.com/uploads/1/3/4/0/134096127/fefabavovofazisa.pdfIn PDF document text
    • https://vokinojen.weebly.com/uploads/1/3/4/8/134851280/vasoba_wizusumaziwi_mufudej_xenamazevufu.pdfIn PDF document text
    • https://nirulutot.weebly.com/uploads/1/3/4/7/134700174/sozunogokubume_bozarew_dapexitujidokob_sigefapaziwi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479224/normal_604c9671de1e0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413693/normal_5fe0b1eb57f63.pdfIn PDF document text
    • https://wididalinur.weebly.com/uploads/1/3/3/9/133986726/92096be98d292.pdfIn PDF document text
    • https://wujewogo.weebly.com/uploads/1/3/4/5/134586314/e1395e.pdfIn PDF document text
    • https://malavaxun.weebly.com/uploads/1/3/4/0/134018228/ximesobijabotez_jebupexiwupeve_lotewisogasebek_wezovijitawow.pdfIn PDF document text
    • https://zukixuvaxetili.weebly.com/uploads/1/3/5/9/135988851/nalamikudolawax.pdfIn PDF document text
    • https://meboropob.weebly.com/uploads/1/3/2/7/132740462/kuvuzawamotaja.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/84f4ba71-da9b-45e3-a8dd-efd32c6de2fa/milivupapowafutupatezano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c47b16a0-adfd-40c0-8e15-445e55b1b3fc/cognitive_behavioural_therapy_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/577e3392-33c8-4092-a313-a3425a7a99db/tipos_de_sistemas_operativos_para_dispositivos_mviles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9888d02-822a-4091-a75f-2ce354006f10/tozejalubeg.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_off0000f7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DA 5428 bytes
SHA-256: d954d137181504fd489fd7609df61109e4f0172c2ce5426cd18fa420e16380ca
font_01_sfnt_off00010a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A43 12780 bytes
SHA-256: 8414359bf5fe0752324fe7e92b684a077545c3cf582f8047da11a53e382ebf4f

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