Malicious PDF — malware analysis report

Static analysis result for SHA-256 b43620ee7cb9477d…

MALICIOUS

PDF

75.9 KB Created: 2021-04-04 04:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d1a375cff70b7620056adc1b6d480b8e SHA-1: 5939b7fd5f897b745d3ffb625652a373c9b5d92b SHA-256: b43620ee7cb9477d503df0e6f1c9d357aaee9439a30a342ca09b186ce80e65a0
186 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 0.9991

Heuristics 6

  • 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.
  • 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://midufefew.ru/wix?keyword=what+is+a+spatial+pattern PDF link annotation
    • https://zisibunekotif.weebly.com/uploads/1/3/4/9/134902626/sugowoz.pdfIn PDF document text
    • https://sagaragevuba.weebly.com/uploads/1/3/4/6/134685912/3005340.pdfIn PDF document text
    • https://bateworolod.weebly.com/uploads/1/3/4/3/134315912/8369007.pdfIn PDF document text
    • http://liwojabegeje.iblogger.org/nuxebedilavaji.pdfIn PDF document text
    • https://joworuzofoluj.weebly.com/uploads/1/3/2/6/132683209/pavejabotufutonevode.pdfIn PDF document text
    • https://dukinuvofipul.weebly.com/uploads/1/3/2/7/132711936/kidulifif-disalodok-sovojimesaropug-dosumotarub.pdfIn PDF document text
    • https://mujolimu.weebly.com/uploads/1/3/4/8/134868529/fovisigu-buvijo-pikikaw-xuxodivewido.pdfIn PDF document text
    • https://bezijenogekise.weebly.com/uploads/1/3/4/8/134875893/keboxabit-xoxakapub.pdfIn PDF document text
    • https://pifofunota.weebly.com/uploads/1/3/0/8/130814871/d7beaa.pdfIn PDF document text
    • https://pubedazemel.weebly.com/uploads/1/3/4/8/134870130/7675448.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rajimorix.rf.gd/les_antimodernes_antoine_compagnon.pdfIn PDF document text
    • https://ce83042b-5faf-46b5-bcbb-9b4d05ec7d33.filesusr.com/ugd/a31856_876e2628b6c3407fa57019f92c8acbe1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/timeziso/lumens_projector_guide.pdfIn PDF document text
    • https://9eb5ee95-128e-4115-bcd6-d8db8525ce49.filesusr.com/ugd/9904c2_9bb36d14545142da8d7909bf0fa147fd.pdf?index=trueIn PDF document text
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_b8f76982ec9b4f2ebdc3cf4b281eb521.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lemerisinivum/can_you_use_polar_heart_rate_strap_with_garmin.pdfIn PDF document text
    • https://4dcfe184-cd6c-48f8-9f23-5461c743a1d4.filesusr.com/ugd/cc8533_09d1165294224c87bcb1a5f02a0f784d.pdf?index=trueIn PDF document text
    • http://lupozefobu.rf.gd/pdf_book_reader_for_pc.pdfIn PDF document text
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_c6ff1f42704542528657a8bb4c12a1af.pdf?index=trueIn PDF document text
    • https://2903667b-e544-4972-ac7f-e5855aaa9b37.filesusr.com/ugd/2cc660_47a68ea6f4dc4cf7b3f113b1aafad1aa.pdf?index=trueIn PDF document text
    • http://mogadaf.epizy.com/worksheets_for_esl_preschoolers.pdfIn PDF document text
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_4c249eac0fcd4d3cbf9e1ab756b1edbe.pdf?index=trueIn PDF document text
    • https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_79430712152e427a8fa4dabc0d508599.pdf?index=trueIn PDF document text
    • http://gafomawonerif.rf.gd/64941245436.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_off0000ecc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC3 4920 bytes
SHA-256: ca92caa79030eb52abb3dfdbf78e9342f620a5173150d3318f715b3b29e7be24
font_01_sfnt_off0000fd84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD84 11064 bytes
SHA-256: 82a3d1605709418170c79d3a3bcb804b54d2697c152411d91ef89fa6bf6f1a73