Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef3c03023584ee0e…

MALICIOUS

PDF

97.8 KB Created: 2021-05-26 14:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 16296c8520d2325ca3c2aaec8f09e418 SHA-1: 120b493b6826dc13b39bacd51d4ce6ae22bad74b SHA-256: ef3c03023584ee0ecc736ec05cdab8f91f521bc42274f6adc55b8d90b3338e71
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • 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://druttle.ru/strik?utm_term=clickteam+fusion+2.5+crack+%25D1%2581%25D0%25BA%25D0%25B0%25D1%2587%25D0%25B0%25D1%2582%25D1%258C PDF link annotation
    • https://wudajelenap.weebly.com/uploads/1/3/4/4/134470879/giwig.pdfIn PDF document text
    • https://jotutavujisab.weebly.com/uploads/1/3/1/1/131164129/2bb1130.pdfIn PDF document text
    • https://nivolepefusux.weebly.com/uploads/1/3/4/8/134886615/vipinoxu_linam_xolivuwatolutox_xaxibufawesibur.pdfIn PDF document text
    • https://lozuninusagutog.weebly.com/uploads/1/3/5/3/135309735/4ed9285932.pdfIn PDF document text
    • https://lobududovidaxu.weebly.com/uploads/1/3/3/9/133997350/delorozufumu.pdfIn PDF document text
    • https://nubiduxabegi.weebly.com/uploads/1/3/1/8/131871606/6332942.pdfIn PDF document text
    • https://rutosediwuxi.weebly.com/uploads/1/3/2/8/132814231/widavavesegiv_teduvexuregevax.pdfIn PDF document text
    • https://lafefetakizin.weebly.com/uploads/1/3/2/7/132712235/dosekotofinabel-gevalazuxigu-rozupideba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480414/normal_601ab00f3fad8.pdfIn PDF document text
    • https://tunuwadubozowe.weebly.com/uploads/1/3/4/3/134363043/e9f0a8f0c520b3.pdfIn PDF document text
    • https://sedanafijokam.weebly.com/uploads/1/3/4/8/134888359/sanipowubalo_devivigufuv_dizaxobaw_gukifokusafan.pdfIn PDF document text
    • https://dufeduvu.weebly.com/uploads/1/3/4/4/134481569/renutarepekirovuzo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485809/normal_60601858cd5d2.pdfIn PDF document text
    • https://lifusapemar.weebly.com/uploads/1/3/4/5/134526201/nofoxumutumeregu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6eb47471-2922-4cd2-8989-99f0d98e46fb/what_does_md_mph_mean_after_a_doctors_name.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/637b9886-d180-4863-8023-90b838371eee/how_do_you_know_if_you_have_pituitary_gland_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8aa67fcd-d77d-42ff-9e75-bc76292c0d93/the_rules_of_attraction_trailer_deutsch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3db6b473-dcf4-464d-8588-27bb3982a052/unit_atomic_structure_ions_worksheet_3_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8752e2b-b385-476c-a189-4c4fde76420d/the_gift_of_the_magi_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a07199a9-a386-484c-98bd-ad15a9525e7b/35245958124.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15490480-4062-4c67-814b-c8f9be93616d/begomuzipigepijikugo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b73c385-25ab-4f14-9ec4-d46f877f65cc/wopetevimokekomuwos.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38D 11804 bytes
SHA-256: bead1544d017902d2c0aac91ad8ccd0c207ad37dbe2f7903fb00cdd2e402df87
font_01_sfnt_off00011a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A62 5916 bytes
SHA-256: ea2a25ea005ea07a4ee924f586787d25f2edf170b0d78f7b641147c2cc4f687a
font_02_sfnt_off00012d95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D95 16708 bytes
SHA-256: 6e152256eff4ebea6790f8d2350c72dc5f53c253ead3c500b95e608d193ed3b4
font_03_sfnt_off000160b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160B1 16340 bytes
SHA-256: f99e96d7e3c7cca6d36c29ca16a010033c205e31a9135fc50aa66938dc030747