Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b30d974524f724e…

MALICIOUS

PDF

75.9 KB Created: 2021-03-17 11:40:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 261d2a6e53104a5b3265eb58d2dbbe9f SHA-1: c3e351e240d9c8bfec749a286b86049eb361da66 SHA-256: 8b30d974524f724e490c6eada9ed5ff2a8ab147073269d4a64a8c4c88234540b
194 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm designed to host numerous external links, many of which point to disposable domains. The presence of a 'download button' lure and a high ML classifier score, combined with ClamAV detection as Pdf.Phishing.Trojan, strongly suggests a malicious intent to redirect users to potentially harmful content. The embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • 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://baarspo.ru/123?utm_term=student+budget+spreadsheet+uk PDF link annotation
    • http://carishr.com/reading_comprehension_activities_for_1st_grade5ch98.pdfIn PDF document text
    • http://femuxeririta.mygamesonline.org/netgear_router_wgr614v9_firmware_upgrade.pdfIn PDF document text
    • https://xisuviwilizej.weebly.com/uploads/1/3/4/3/134320176/6647195.pdfIn PDF document text
    • https://rozeravepirasaj.weebly.com/uploads/1/3/2/8/132816036/sedibamoxejisop_ramuke_gumokunafem_goxizaton.pdfIn PDF document text
    • http://sokinabunerir.iblogger.org/24_hour_time_worksheets_free.pdfIn PDF document text
    • https://xibuzapesajeg.weebly.com/uploads/1/3/4/2/134236274/5251120.pdfIn PDF document text
    • https://xezatitewifesel.weebly.com/uploads/1/3/4/3/134393938/58eea1.pdfIn PDF document text
    • http://muzesumulel.getenjoyment.net/baby_song_lyrics_download.pdfIn PDF document text
    • http://sewaluxedidijug.iblogger.org/anthropological_thought.pdfIn PDF document text
    • https://sakuvajavabese.weebly.com/uploads/1/3/1/3/131383602/kenebi-gesesa-besuperimo-lujejupakava.pdfIn PDF document text
    • http://drenajkrasnodar.ru/45129444320qqpjf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vevuweminofilo.rf.gd/kowajakopifatojujatepabin.pdfIn PDF document text
    • https://21d44941-995c-48b9-956b-8145330e20d5.filesusr.com/ugd/577b75_758eb6cdf5ff4fd78cdb47767db5bb0c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4049f95a-30f0-41d5-9a45-5d6cb7aef574/gozolaseb.pdfIn PDF document text
    • http://tiwatimab.atwebpages.com/chick_fil_a_catering_menu_prices.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65c95834-ac79-4dc1-996c-db375ea7437b/rufavozes.pdfIn PDF document text
    • https://5e9816b5-e261-4a84-a5c7-594b6999e1c8.filesusr.com/ugd/eb2f7d_84de739366db4419a6110fc461edf7ec.pdf?index=trueIn PDF document text
    • https://fb5b3b17-6e6a-47c5-ae49-26eddba71e57.filesusr.com/ugd/aff7be_3b34ce629f2d401083819564239aec72.pdf?index=trueIn PDF document text
    • http://tetomor.rf.gd/kozut.pdfIn PDF document text
    • http://vekabun.myartsonline.com/xutupevikaranuwiriposos.pdfIn PDF document text
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_0d3e9fb46fe949128a4f33253239a4a7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d7a6d8f-9b00-4167-b9f4-35cb6f2cac37/star_trek_the_next_generation_season_1_episode_26_dailymotion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/563438ca-9d4f-437b-a314-e3d85b561914/how_do_i_save_an_email_as_a_on_a_mac.pdfIn PDF document text
    • http://duxegejuw.atwebpages.com/canoscan_9000f_mark_ii_scan_to.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_off0000e9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D4 5496 bytes
SHA-256: b724c3875c5276b1d11b4e6c0e7650d88f008750edbfecab165cf48a35b49ce1
font_01_sfnt_off0000fc6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6F 10568 bytes
SHA-256: 74ee813524fce5220c71f0fb93838105bfe2f16f036cc74621b1af3599c67b8b