Malicious PDF — malware analysis report

Static analysis result for SHA-256 73370a189718afe4…

MALICIOUS

PDF

85.0 KB Created: 2021-04-01 17:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 116506524bd8b8090c10c91c65e7eef8 SHA-1: a737635159137ee65caf6e27528ae98081294c57 SHA-256: 73370a189718afe48642034194f98d832113c6e10fd9938543b9346b00fcc575
126 Risk Score

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 0.9950

Heuristics 5

  • 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 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://lozipotod.ru/wix?keyword=pedro+martins+manager PDF link annotation
    • http://opendouche.xyz/89043995975jn6c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474999/normal_5fe8df5563162.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486200/normal_5fc67ce2166e0.pdfIn PDF document text
    • http://tryse.xyz/sri_rudram_chamakam_sanskritarmf6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370285/normal_60193865dc70d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450418/normal_6006ad0e83e9d.pdfIn PDF document text
    • http://dfwshootersupply.com/14368791907hqson.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424405/normal_5ff7d0af393fe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502817/normal_5ff679f2c50aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473651/normal_6039abf26ac4f.pdfIn PDF document text
    • http://creditactive.info/pidamodakibuponavorugetoafvas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444884/normal_602c8773cd809.pdfIn PDF document text
    • http://skidki-day.site/what_percent_of_living_organisms_are_made_up_of_cells_quizlet7dcr9.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
    • https://s3.amazonaws.com/penale/wowogaturerudejitul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfb0044a-9bbe-424b-bc27-3af97ca34445/19144020210.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a06fef1-c541-42ad-a5c2-657b0fb71d6a/ikea_kitchen_catalogue_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/15232180379.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/posolalekavazok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/301ef2bf-92fa-44c2-b077-373bbcbbbcb0/pitinigafojin.pdfIn PDF document text
    • https://efe523a3-d756-4f55-ba91-412f3a718e00.filesusr.com/ugd/236571_fab9ecf65b764065be9d6b16a3bee26f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f5ffacd-34c2-4b73-8651-484034c96943/laxudazolemakenepomeru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3392be01-4902-4fa9-9a2e-237c4d0a38da/senavezevo.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/netflix_android_10_apk.pdfIn PDF document text
    • https://76bf09fe-c378-4d6f-baa9-beaf48595a8b.filesusr.com/ugd/61567a_5b43bf451ea8457e808d07f0bf68b769.pdf?index=trueIn PDF document text
    • https://71e5fc8e-cc9a-4633-96c3-2c70acd464d0.filesusr.com/ugd/f08e01_cda67f1dd56c4b06ad89c5ff1bb8b361.pdf?index=trueIn PDF document text
    • https://041bbef9-4dd1-43b9-9ec7-2672afc16ec1.filesusr.com/ugd/686814_1e88533a504d4967b0c6ae2a06a7334b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/formacion_de_boca_vs_river_superliga_2019.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF684 4904 bytes
SHA-256: a064dcf0cee9bbacdd7d911321b4348e8bbb659863e090c70d7e6560fd0c261f
font_01_sfnt_off00010703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10703 16344 bytes
SHA-256: 6b8c960ee07fce485e9bb5e87b13ebde3988d8e9fa29a44880bb540ac719fb75
font_02_sfnt_off0001380b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1380B 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3