Malicious PDF — malware analysis report

Static analysis result for SHA-256 25e39e7c1fc7730d…

MALICIOUS

PDF

79.9 KB Created: 2021-05-17 22:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 02b8f985e71394a7d03689157a5a5fef SHA-1: 55c5a9cf21cc1cc8a2099432fad3134ab85ab825 SHA-256: 25e39e7c1fc7730da25083acafe29af99ea117f3fe2653f84e43d0478d6a6945
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 5

  • 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.
  • 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://dafemum.ru/strik?utm_term=how+to+get+the+answers+to+edpuzzle PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460963/normal_5fdab61f41457.pdfIn PDF document text
    • https://pofofeteb.weebly.com/uploads/1/3/2/6/132681268/8c1b3e0aa748df.pdfIn PDF document text
    • https://gibitomenufe.weebly.com/uploads/1/3/4/0/134041720/rarepu_simid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483075/normal_60555240d25f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474462/normal_6056384e83321.pdfIn PDF document text
    • https://sugasukeni.weebly.com/uploads/1/3/4/8/134878852/linawitutef-dobojafik-niluwetifepaj-sanegepotogali.pdfIn PDF document text
    • https://kenawogerawe.weebly.com/uploads/1/3/4/5/134593039/f04956.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426697/normal_5fdb39b8f3eef.pdfIn PDF document text
    • https://juxipidupe.weebly.com/uploads/1/3/4/6/134694928/sufubolamo.pdfIn PDF document text
    • https://tifalexax.weebly.com/uploads/1/3/4/4/134471923/9743994324.pdfIn PDF document text
    • https://tifowufiwadoxi.weebly.com/uploads/1/3/4/0/134098290/55ecaf.pdfIn PDF document text
    • https://pupikitonusu.weebly.com/uploads/1/3/5/3/135301263/vokezafesanisazu.pdfIn PDF document text
    • https://vumukawa.weebly.com/uploads/1/3/4/6/134662430/fipimajikol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477379/normal_5fdbcb8a13741.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/vetamedisoz/11104917299.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/75452010576.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1326c33-55fd-4b4f-b7d4-517f78b68d07/what_is_the_focus_of_classical_management_theory.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36170236-7eb4-4ae4-83c8-0f4227c3706b/biografia_de_modelo_atomico_de_schrodinger.pdfIn PDF document text
    • https://s3.amazonaws.com/fexuror/babylon_farsi_dictionary_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbd7e2b7-38dc-4edd-9456-de741383874b/accu-chek_aviva_control_solution_msds.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/fevisexawum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/217e01bf-a3da-425c-a25f-74a986eb4b62/harry_potter_patronus_quiz_wizardmore.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/chiari_malformation_surgery_nhs.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/crunchyroll_free_premium_android.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/xovugi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a0b6e62-3a0f-4e90-9a0b-14a0e3dd3d89/57416721127.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_off0000f515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF515 5324 bytes
SHA-256: 1edff3dc90e4a178805e418673340eab4ee055400f22077b7bb5cab08d9408e6
font_01_sfnt_off00010745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10745 12620 bytes
SHA-256: 691358bbe008a3ef8d2fe31ff240972417a856d8d0087030dbf8ebb7df824c8b

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