Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c6dbc65c7df5e2f…

MALICIOUS

PDF

78.1 KB Created: 2021-05-11 04:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: fd8bf831cc56945efd7804c9be22a96d SHA-1: a64c60605fd2af330aa4e140ae00c816f064524b SHA-256: 3c6dbc65c7df5e2f006e3902e22a199acc875c139e31eb09e617b598df259d53
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to PDF files hosted on S3 buckets and other domains, suggesting a link farm or distribution network. One prominent URL, https://jacksth.ru/strik?utm_term=msi+970a-g46+drivers+windows+10, appears to be a lure for downloading drivers, aligning with the document's content which mentions 'Msi 970a-g46 drivers windows 10'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://jacksth.ru/strik?utm_term=msi+970a-g46+drivers+windows+10 PDF link annotation
    • http://lodixol.22web.org/basics_of_computer_download.pdfIn PDF document text
    • http://joblanc.xyz/goleman_six_leadership_styles_self_assessment_questionnairelyn1e.pdfIn PDF document text
    • http://instapriz.website/66256140016v9wuo.pdfIn PDF document text
    • http://robertferrell.net/geometrical_and_physical_optics_longhursttln7j.pdfIn PDF document text
    • http://mishabelle.ru/what_is_hyposecretion_of_the_thyroid_glanddjx7a.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/bojafazes/safapajevurukidodidetaja.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/how_can_i_get_my_cdl_for_free.pdfIn PDF document text
    • http://badetez.epizy.com/dell_3520_price.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/nelixabularipozasena.pdfIn PDF document text
    • https://s3.amazonaws.com/farokof/26697432328.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/bobenexuwulenufumaba.pdfIn PDF document text
    • https://e082cb0d-9c22-4a21-acb7-e2c6127a51d3.filesusr.com/ugd/ff0c06_176c296783f9476da962d19bb474566f.pdf?index=trueIn PDF document text
    • http://lozepis.epizy.com/adeste_fideles_accordi.pdfIn PDF document text
    • https://s3.amazonaws.com/jugobimuraje/dod_civilian_equivalent_to_military_rank.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/install_android_studio_linux_zip.pdfIn PDF document text
    • https://67d298e0-85f4-4ad4-bf36-e1ac857e42fc.filesusr.com/ugd/b6bf5b_cff236f8b8ca4e34a554eb486dec7b92.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/rabivifuzibasobujul.pdfIn PDF document text
    • https://s3.amazonaws.com/bagokiko/systematic_integrative_literature_review.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/how_do_i_connect_my_canon_mg3520_wireless_printer.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/51228261548.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/telugu_christian_songs_free_naa_songs.pdfIn PDF document text
    • https://c31d65df-273c-4bcc-acfb-7b03b0724b99.filesusr.com/ugd/e7e4a0_acf9f749e6f3457fab88da62c4fda6a2.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_off0000f023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF023 5824 bytes
SHA-256: 108a777e18a44e95a3ac6e402a5a173edb6c0b7b928e47c6bc761b4efb899966
font_01_sfnt_off00010433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10433 11308 bytes
SHA-256: 8195b7b8e02022a06ff4e371fe1868991c92099969d890c3323b33857a423689

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