Malicious PDF — malware analysis report

Static analysis result for SHA-256 697cc2a35796e66a…

MALICIOUS

PDF

75.3 KB Created: 2021-02-24 09:23:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a0703fb104d001678ec7462046db99a1 SHA-1: 45bb0e99d871118723a8a6c14064ade84ddfe36d SHA-256: 697cc2a35796e66aad273f64ef3d8913ce7f7dfd1ea36dae7bf0f0908166f153
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links pointing to other PDF documents hosted on various domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URLs and the heuristic findings of a 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/strik?utm_term=this+is+amazing+grace+lyrics+ukulele+chords PDF link annotation
    • https://zimolitavok.weebly.com/uploads/1/3/1/8/131856331/veruv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376372/normal_600b717cc25a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383702/normal_5fcb61a31713a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368224/normal_600bf8f041f36.pdfIn PDF document text
    • https://simisodiguguvig.weebly.com/uploads/1/3/5/3/135324772/nadajogi.pdfIn PDF document text
    • http://madokedaxemosu.22web.org/mobylette_peugeot_103_spx_a_vendre.pdfIn PDF document text
    • https://sajakuvidosub.weebly.com/uploads/1/3/4/4/134496924/gabinotikuji-bunobu-kojezulatuk-fijefe.pdfIn PDF document text
    • https://pudijeda.weebly.com/uploads/1/3/4/5/134586696/wawukolagilopil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373297/normal_6008fb3941f43.pdfIn PDF document text
    • https://sekilulijafos.weebly.com/uploads/1/3/1/4/131438177/livijotumi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393362/normal_601d22391c83e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366031/normal_60107e97f31dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369330/normal_5fe77a08b5dcf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379374/normal_600df9c2be20b.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/babuxufarizuxur/demon_hunter_vengeance_guide_7._1._5.pdfIn PDF document text
    • http://fujirezidixivu.rf.gd/where_are_the_mounds_in_ohio.pdfIn PDF document text
    • http://giwurebo.rf.gd/driver_sound_card_focusrite_solo.pdfIn PDF document text
    • http://gejaliwujabe.epizy.com/35228137500.pdfIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/vukewizokalefamox.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_off0000e9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B7 5520 bytes
SHA-256: 3645124025a6c060c26e3f897df6cd6834a33b48c36c0a4cd08bc13a62d1c95e
font_01_sfnt_off0000fc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC61 10344 bytes
SHA-256: 056276b3b20d2c6a7318b6d76920a540200d95adc444a9d96979adea8bea60c6

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