Malicious PDF — malware analysis report

Static analysis result for SHA-256 b90493d87079458d…

MALICIOUS

PDF

78.6 KB Created: 2021-04-20 10:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 48278944657bd874ac52293670b9e750 SHA-1: ee323bb27f42284123d9123c091ec089fa278215 SHA-256: b90493d87079458d65eaec400f3aac99776172ed277a53adbe9b494cf422fee7
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to manipulate search engine results or distribute further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of a 'download' button lure further supports a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://seumenha.ru/strik?utm_term=stihl+backpack+blower+br+700 PDF link annotation
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403271/normal_602805c9d113a.pdfIn PDF document text
    • http://legalvictory.group/jekoxosebowqqguq.pdfIn PDF document text
    • http://waystep.site/photography_and_video_production_business_planmme8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376875/normal_5fca05d66dc94.pdfIn PDF document text
    • http://moymagazin.xyz/asmaul_husna_artinya_dan_arabnyay3muj.pdfIn PDF document text
    • http://micrometer25bill.site/65806999306r14ze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1a9cd40a-f0d6-44d4-a143-19288280ca2b.filesusr.com/ugd/7a13df_ec2ce30a4b8d4adcacc5cca46df27704.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b939348-cac2-40b0-af49-c9952d87661e/318-14_building_code_requirements_for_structural_concrete_and_commentary.pdfIn PDF document text
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_3122917757a14f5a8d3056598ee0df41.pdf?index=trueIn PDF document text
    • https://e25b7b56-d8f7-44cb-9276-56428e53d1cc.filesusr.com/ugd/63f3e8_b5c60055def74ec199e9776cdd99ab97.pdf?index=trueIn PDF document text
    • https://66547991-fb4b-492c-b271-2b6457db34f0.filesusr.com/ugd/a98e70_be3d88a6e82e48e9942fc303734613ac.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/9295868501.pdfIn PDF document text
    • https://37cc4ef3-276f-49d0-84f3-8bc08bbde6a9.filesusr.com/ugd/e4a5d4_5b10e3573b1143499074cce4ffd96c5f.pdf?index=trueIn PDF document text
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_cc63a7a68a754dadbdb36337693c961f.pdf?index=trueIn PDF document text
    • https://1d812fcc-cfc3-4558-a870-56fc5b7f4c2e.filesusr.com/ugd/754d94_42225ccce6d24b60a67ae33e0bc65982.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/luborinizu/balancing_math_equations_worksheet_elementary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03a00b2e-d8f2-4abf-b90a-fdd464bcb450/79151369347.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/37671236652.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/fbise_date_sheet_hssc_2019_part_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8258b5b-a659-447a-9152-f5ec3fbafc3e/16584387992.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_off0000f06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06E 5464 bytes
SHA-256: 5cce7de69c819c92d2bb0ade3c15fdbdaac6fd62a4d03cad5b3b737003dc009c
font_01_sfnt_off00010315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10315 11936 bytes
SHA-256: c84ad641a2bb1a58cc2b8b6fde5239099c677f462ba25387511a9afc6ffe2f7c

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