Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b506d4f8a75d229…

MALICIOUS

PDF

79.9 KB Created: 2021-03-12 04:15:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0ba0c72efdec8bd18037e24263838d68 SHA-1: 6e82b715de7fc0ec0c7f411a2fd7d949d7485b18 SHA-256: 8b506d4f8a75d229c61ee4d07361c066aa4401036f5bc210bcffdf5e14e592f4
212 Risk Score

Malware Insights

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

The PDF file contains a lure related to a 'Fluke 87v digital multimeter manual' and includes multiple external links, one of which is identified as an SEO redirector. The ML classifier and ClamAV detection strongly indicate maliciousness, likely phishing or malware distribution. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 8

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://nipisod.ru/123?utm_term=fluke+87v+digital+multimeter+manual PDF link annotation
    • http://redpandarecycling.com/exerpeutic_900xl_bikeaqel2.pdfIn PDF document text
    • http://posebakuxosafod.getenjoyment.net/slope_intercept_form_to_standard_form.pdfIn PDF document text
    • http://bibopasaxuvibu.mypressonline.com/sewaviwupuruxosexujo.pdfIn PDF document text
    • https://wujuzuvetawi.weebly.com/uploads/1/3/1/3/131379059/3f311eaa490.pdfIn PDF document text
    • https://xupajipodiburut.weebly.com/uploads/1/3/0/8/130814024/bagejaw.pdfIn PDF document text
    • https://fudesatalaponu.weebly.com/uploads/1/3/2/7/132710537/loxivokolubataxiz.pdfIn PDF document text
    • https://relitemora.weebly.com/uploads/1/3/4/3/134352419/e9710e2.pdfIn PDF document text
    • http://moresukko.ru/bozazohtjwt.pdfIn PDF document text
    • http://teksalle.xyz/20039628040khp7f.pdfIn PDF document text
    • https://siroxaje.weebly.com/uploads/1/3/4/0/134000026/6429660.pdfIn PDF document text
    • http://zuduwamani.mypressonline.com/40_laws_of_power_book.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nerezusilanake.atwebpages.com/2005_dt466_injector_replacement.pdfIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/create_biodata_format_for_marriage_online.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/information_overload_social_media.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/buboselukila.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/phpspreadsheet_export_excel_laravel.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/minecraft_pc_latest_version_cracked.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/95667898281.pdfIn PDF document text
    • http://nisetekotixob.myartsonline.com/multiple_intelligence_survey_for_elementary_students.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/akali_rework_combo_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/new_bangla_movie_video_song_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/gijuresukulivamitiviko.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/performance_appraisal_examples_education.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/audio-technica_at-lp60bk_fully_automatic_belt_driven_turntable.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/45235975673.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_off0000fbdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDD 5320 bytes
SHA-256: 4a27c0d9d9d5d2fcecb86ebbb3563211e1dc27a8fbe5046b2c6f65bc8d8a12fb
font_01_sfnt_off00010df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF1 10616 bytes
SHA-256: 34a3881f564a9eb877bc2bd11792927b12e01458285950f3943be99153569abd