Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e2ea80ecca21a2c…

MALICIOUS

PDF

139.8 KB Created: 2021-03-16 09:54:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d40320627fee2cdb00bb14bc80700440 SHA-1: 99efa907f01c4e97d5d66ed687fab32cfb6dd2d3 SHA-256: 5e2ea80ecca21a2ca99cf1d72772b62a82b389f5de8d83add14f21d5394171f3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9990

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 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://leonvi.ru/strik?utm_term=symbolic+logic+is+also+known+as PDF link annotation
    • http://raisinshq.pro/bojulixepuwuxenilagilokuqwqv.pdfIn PDF document text
    • http://mesretly.xyz/sazowutozuvarobegenld9ng.pdfIn PDF document text
    • http://dress-russia.ru/install_guide_wordpress_plugin_without_ftpqg0r6.pdfIn PDF document text
    • http://bexukavinawexov.mygamesonline.org/adding_and_subtracting_fractions_worksheets_6th_grade.pdfIn PDF document text
    • http://ovca.space/46865923792th8jq.pdfIn PDF document text
    • https://reponobokuwe.weebly.com/uploads/1/3/5/4/135401207/8fe795340beafc7.pdfIn PDF document text
    • https://kavirozix.weebly.com/uploads/1/3/3/9/133999962/b7b54282c1c3f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501356/normal_602a153c784f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403687/normal_5fcf7309e98bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369514/normal_5ff86edc19388.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bujekotu.atwebpages.com/dibinetujijipebeworaduto.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/ethmoid_bone_cribriform_plate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b6caea0-06ef-42c7-b994-b18a597bd7e3/how_to_calculate_boiling_point_with_pressure.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/1979992771.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de0e2a0b-96aa-4165-a3e5-d0f6952c7ed4/datuzizujabotunaluzi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8cb1424-1242-4341-a092-070dfd425bf5/biomedical_engineering_bridging_medicine_and_technology_download.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001bc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC94 5116 bytes
SHA-256: 6d9412f337f227c0e8f2a6e3d939160ee32c1195804935fb62c7171eba41bd53
font_01_sfnt_off0001cde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CDE6 15516 bytes
SHA-256: 911270e55a653a73a72e2001c287dfaa80de0961d0ef4ba874fa8cd5b7f1c363
font_02_sfnt_off0001fd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FD82 16360 bytes
SHA-256: 52f65f24cb7e4432368e6c01e6403eb886a2df3025aa90e473ee7b40ba8b4e7b
font_03_sfnt_off00021375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21375 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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