Malicious PDF — malware analysis report

Static analysis result for SHA-256 37841becd86a1806…

MALICIOUS

PDF

78.3 KB Created: 2021-03-30 15:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 74f3ad91ead1ecbe5dd3fa687c881e74 SHA-1: 72f5de93b1a76d401f05253ea3c9ed29a68e255f SHA-256: 37841becd86a180686f2a5600e494f016a955d03bd45633221448bd38a4a4189
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious domain, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV detection further support its malicious nature, flagging it as a phishing trojan. The document body, though heavily obfuscated, appears to contain metadata related to PDF generation and potentially a lure related to 'edpuzzle youtube'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=how+to+use+edpuzzle+youtube In PDF document text
    • https://cdn.sqhk.co/kibukumivu/UAgiUXV/sozuvetebaxajimaxi.pdfIn PDF document text
    • http://stickerrus.ru/poly_pop_3d_sphere_puzzlesbc28.pdfIn PDF document text
    • https://fuwefepitebu.weebly.com/uploads/1/3/4/7/134709748/wopasesibe.pdfIn PDF document text
    • https://pagejenaxupiwig.weebly.com/uploads/1/3/4/3/134383440/984092c2f86a4.pdfIn PDF document text
    • https://cdn.sqhk.co/leburogutu/gjRQ6iC/pasomalufilexubinabodo.pdfIn PDF document text
    • http://webmastervlad.ru/2008_chrysler_town_and_country_transmission_replacement_costa6sby.pdfIn PDF document text
    • https://ninegepidilu.weebly.com/uploads/1/3/0/7/130738727/jimukojinu.pdfIn PDF document text
    • https://cdn.sqhk.co/vapatibu/bxGHMic/ice_cream_stores_for_sale_in_ct.pdfIn PDF document text
    • http://joblanc.xyz/identify_radius_and_diameter_worksheets8md2i.pdfIn PDF document text
    • https://cdn.sqhk.co/nopawuwam/TNaEeKf/3_week_weather_forecast_for_los_angeles.pdfIn PDF document text
    • https://tumozoredupoki.weebly.com/uploads/1/3/0/9/130969837/futosavirotut_nabejunolez_nusumufijit_mufodumubutefap.pdfIn PDF document text
    • http://scandisvet.ru/48108036171ccm65.pdfIn PDF document text
    • https://fetagurekejoj.weebly.com/uploads/1/3/2/7/132741571/lizemoxominula.pdfIn PDF document text
    • https://memonimip.weebly.com/uploads/1/3/5/3/135349780/rutofelovetapuv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/113a6e7d-a167-4499-897e-ab98855f73c8/can_i_break_my_lease_due_to_coronavirus_california.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de0ca1a7-6b42-4219-8ec1-b958d9b5b9e8/51524680864.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1ad3ba8-a663-49ec-a62c-8c321af790e1/bella_coffee_maker_reviews.pdfIn PDF document text
    • http://mizapezimoz.rf.gd/coleman_saluspa_inflatable_hot_tub_replacement_pump.pdfIn PDF document text
    • http://sobakijej.rf.gd/88438905352.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d57c6a01-b93b-4688-9591-1a1990f5bf12/different_types_of_camera_shots_angles_and_movements.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89D 4720 bytes
SHA-256: 730706c9c1e0efabea66586c66cc91871ff4433b46805ddd9e710ee5152ee0ac
font_01_sfnt_off0000f8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D3 11052 bytes
SHA-256: 573eba3cc1be1c0f85f9a5ae96ebd3432a783b16dffcfb9b5a5edb9efc062228
font_02_sfnt_off00011e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E24 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e