Malicious PDF — malware analysis report

Static analysis result for SHA-256 c820e520bf10ce1d…

MALICIOUS

PDF

67.7 KB Created: 2021-04-03 22:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 60ec21da382e40e5a3f2fd2f5d76aa39 SHA-1: d817cee4d58628f8993ca5e2fe71c1cafdebf1a6 SHA-256: c820e520bf10ce1d9bf69535a3c5249ae8c30ea937529733cb3400e318666b7a
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains a large number of external links, with 'http://deemonatrafik.xyz/how_to_add_power_steering_fluid_honda_accordqv7z0.pdf' being a prominent example. The presence of embedded URLs like 'https://nipisod.ru/wix?keyword=lixiviaci+c3+b3nt' further supports the attack pattern of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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://nipisod.ru/wix?keyword=lixiviaci+c3+b3nt PDF link annotation
    • http://deemonatrafik.xyz/how_to_add_power_steering_fluid_honda_accordqv7z0.pdfIn PDF document text
    • http://eushopvmn.site/xikaxes5dqkk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489586/normal_5fe6a28c5827e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494432/normal_5ff6c51f35110.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372085/normal_5fcf4921a40f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406229/normal_5ff66ea9e89ec.pdfIn PDF document text
    • http://adanakebap.org/49291848914kiffr.pdfIn PDF document text
    • http://reform-st.ru/bovafojbv79d.pdfIn PDF document text
    • http://topcreditscore.info/jejoropukuoqz34.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367665/normal_60098f77c39ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413111/normal_604f0bc04ec01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367305/normal_6021ab71a5442.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/firigugixujotov/geometry_basics_angle_addition_postulate_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/mipebisuwuwinedujo.pdfIn PDF document text
    • https://3cde87c3-25ab-478b-b58d-ba072f1c7540.filesusr.com/ugd/255d97_a7cc1845a4664e6cb764531f35404eba.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jipowumat/responsive_bootstrap_ecommerce_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wutogugej/2021_poker_tournaments.pdfIn PDF document text
    • https://d5aacb37-8766-4234-9cc8-c2ec3b911aba.filesusr.com/ugd/1e723b_2908ffeb32fb4f7c8fa331662fcbccdb.pdf?index=trueIn PDF document text
    • https://3f735f5a-cd1c-4288-bd93-adeff6e084d9.filesusr.com/ugd/bcc0e4_e12dec55cde44dafb77c6918d1e8074e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/vumof.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/ant_video_er_for_firefox.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/alloy_wheel_nuts_size_guide.pdfIn PDF document text
    • https://27158da8-170d-48ca-a528-b8ced62fe517.filesusr.com/ugd/9fc8c3_8cdff9259cf44c1bb35915f93ba899ab.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_off0000d186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD186 4860 bytes
SHA-256: c3422f2577a382ef2a960e6aec1ed4d8b3099c22242f9ba01d4e6f9ace5f7bd5
font_01_sfnt_off0000e231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE231 9196 bytes
SHA-256: 4d5d932755a10335ebfd091b15312a47b9556f4ff8ef8e90eda68034cede5eb6

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