Malicious PDF — malware analysis report

Static analysis result for SHA-256 7df4e246d002c3d0…

MALICIOUS

PDF

80.4 KB Created: 2021-04-23 04:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fdc1ca4a6d86b0bc29d0c822d5d7bb78 SHA-1: 828a7b183fd7d45196a3141e7d411b17d9e3ee5b SHA-256: 7df4e246d002c3d005ee019e67d52d62af312aa6a73dcd02cc620f8a87d20a76
156 Risk Score

Malware Insights

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

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 0.9998

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 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://pelibifir.ru/strik?utm_term=how+to+change+a+taylor+scale+from+kg+to+lbs PDF link annotation
    • http://sluzhba1.net/can_you_take_your_permit_test_online_in_south_carolina0x2xx.pdfIn PDF document text
    • http://bisituz.sportsontheweb.net/92465302858.pdfIn PDF document text
    • http://my-favshopg.online/el_pensamiento_lateral_edward_de_bonosn8eo.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://witefuru.rf.gd/nukamixunulanilabejetiz.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/gereke.pdfIn PDF document text
    • https://91313464-3f42-441e-b0e8-b27065d471ad.filesusr.com/ugd/ee9d3f_89ff7d69e43c4d8098dc256cb8ed7af3.pdf?index=trueIn PDF document text
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_c8ef558291394df39f441724d8154d20.pdf?index=trueIn PDF document text
    • http://firuxafuxu.rf.gd/the_sociological_imagination_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/delta_planer_22-540_c_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/potofaw/physical_science_grade_12_book.pdfIn PDF document text
    • http://peruroz.onlinewebshop.net/98871782496.pdfIn PDF document text
    • http://timufumanusu.epizy.com/61069315079.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/dream_machine_icf_c218_set_time.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/jitidev.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/37164871199.pdfIn PDF document text
    • http://fiwimawa.rf.gd/alcoholic_liver_disease_case_report.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/l_love_mummy_song.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_off0000fb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB85 5652 bytes
SHA-256: 4d36412c60b2b13e2252df062e382d02bf41795a1c271c2086995fe15694535d
font_01_sfnt_off00010eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB4 11020 bytes
SHA-256: 1ea5240c1a1df94fea11fffdeff5dfe0d94a8a651be930f771079b4cc76b1aa6

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