Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b10a45e9aecd5d9…

MALICIOUS

PDF

80.3 KB Created: 2021-05-08 20:41:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f038e22888d617fcf6a9a6a7dde580f1 SHA-1: cfe2a2ddec791afb7031bb59e65255c99c73c0b0 SHA-256: 6b10a45e9aecd5d928bca4c15878d06e5c8cc3f09e928e803f4f79c0fe1d452b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs and link farm heuristic point to an attack pattern involving redirection to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ponafet.ru/strik?utm_term=how+to+raise+money+running+a+half+marathon PDF link annotation
    • https://radutarogo.weebly.com/uploads/1/3/4/3/134379411/4359263.pdfIn PDF document text
    • https://nuzefamulazoxiz.weebly.com/uploads/1/3/4/5/134582777/fiferan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472491/normal_5fef53ab562bf.pdfIn PDF document text
    • https://vozabamoz.weebly.com/uploads/1/3/5/9/135959881/wigasutovajumigoxixu.pdfIn PDF document text
    • https://pedigibija.weebly.com/uploads/1/3/1/8/131857049/b0e978b9250fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380674/normal_6046c29dcd6ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460473/normal_60623b8e9dc1e.pdfIn PDF document text
    • https://jarajegixam.weebly.com/uploads/1/3/1/4/131437089/wolaluxavenis.pdfIn PDF document text
    • https://guladusive.weebly.com/uploads/1/3/0/9/130969442/d928bf5e3136a98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482023/normal_604de04f89853.pdfIn PDF document text
    • https://kodejisejawap.weebly.com/uploads/1/3/2/3/132302923/fd6dbd230dd8.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/8e117829-7811-48b9-bcd0-97b85e1ae6d5/name_the_vampire_diaries_characters_quiz.pdfIn PDF document text
    • https://0ea1ff7f-05b3-43a2-9744-178351a05ed1.filesusr.com/ugd/01f9b9_9fa2b83da68e4600ac8845069a280bfe.pdf?index=trueIn PDF document text
    • https://234d5d8d-19c9-4cab-a884-dd0775662658.filesusr.com/ugd/fb7225_a26012e0a0444b9c97d64e2de4cb1293.pdf?index=trueIn PDF document text
    • https://95e354e6-8561-4e52-807b-deb85f3b5fdd.filesusr.com/ugd/ca9b0a_afc0b103eeea4c3fb33e6b8c96ae0921.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5157a34-4f16-4f55-b134-af1b95d43378/writing_board_game_rules_template.pdfIn PDF document text
    • https://203aa715-7352-46b1-b16b-5d0aeeaa27a2.filesusr.com/ugd/0582e0_328dd957301349f8a753e9bacee07945.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/da1bf718-0dba-4443-97a7-eef364b77fa4/lanemokedososirut.pdfIn PDF document text
    • https://711920be-b761-4f0e-a604-762b26663b16.filesusr.com/ugd/ffcbea_02dc50cdb60f463db34d0d59bd7601b9.pdf?index=trueIn PDF document text
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_ba818fb52c6d48529159310ef16132f5.pdf?index=trueIn PDF document text
    • https://7ef5d8b8-74ac-4e0a-b0a0-fa61ca6462a8.filesusr.com/ugd/23e9be_f31ca284d03f462995c89f8942aa543c.pdf?index=trueIn PDF document text
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_00d87b0322e34cc3baefe94c11721491.pdf?index=trueIn PDF document text
    • https://3f740848-0e57-4b51-8596-564812021bec.filesusr.com/ugd/cbe17c_772846a12e26475998546533292311d3.pdf?index=trueIn PDF document text
    • https://d525ee04-2a40-494f-8ba9-fee52f7b18ee.filesusr.com/ugd/8b8e24_c5d1ac04f55b4a1db776d3e29ce13f7d.pdf?index=trueIn 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_off0000fd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD78 5336 bytes
SHA-256: b71e8e408a55caa396a3d2c71d1dea1afbfed53541e8496cbc20c0b91a14f333
font_01_sfnt_off00010f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F87 10728 bytes
SHA-256: be6f1795c02a7ef82e5783e4a60d3ae4eaff407571b90e86bede680a1f476cf1

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