Malicious PDF — malware analysis report

Static analysis result for SHA-256 10e9762a2051161b…

MALICIOUS

PDF

74.3 KB Created: 2021-04-03 23:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7da6b69ecfa2e0b9a7dc9920b6acb7c0 SHA-1: c0c2fa90b04e3cc6756dd2bb01af0af20748ec76 SHA-256: 10e9762a2051161b18f2e2357a9fc56918e8132e6664d6a9c51699a5834dd52f
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as 'Pdf.Phishing.Trojan'. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure disguised as an 'English curriculum guide'. No scripts were extracted, but the presence of numerous external links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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/123?utm_term=english+curriculum+guide+deped+pdf PDF link annotation
    • https://cdn.sqhk.co/siviraboriru/idjaXA8/pusher_master_big_win.pdfIn PDF document text
    • https://fatomomome.weebly.com/uploads/1/3/1/6/131606630/vakamutoginowo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488809/normal_604b6242e6680.pdfIn PDF document text
    • https://cdn.sqhk.co/jagibuvat/djgjajf/popirodegimedawodibedimu.pdfIn PDF document text
    • https://serekarivevug.weebly.com/uploads/1/3/1/4/131407867/357eed1abcc4.pdfIn PDF document text
    • https://mogopefisumiba.weebly.com/uploads/1/3/5/2/135295831/c29faeb9f8534.pdfIn PDF document text
    • https://cdn.sqhk.co/tutabalero/Z6he2ja/42416945463.pdfIn PDF document text
    • https://cdn.sqhk.co/wadupaxi/d9msibY/vedaxifiwefowexekovufama.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408863/normal_60223d0520c25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446925/normal_6011a5bd3afb8.pdfIn PDF document text
    • https://butevexonukuzi.weebly.com/uploads/1/3/2/6/132681970/fomibijenewex-zikumumakagiza-zimufepax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480590/normal_5ff697e008aca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481168/normal_603daabdbd882.pdfIn PDF document text
    • https://rarakini.weebly.com/uploads/1/3/4/8/134884681/763821.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/8ab17cf7-f833-4b74-bd5b-b5c1d238f97a/jewageletobapokavoju.pdfIn PDF document text
    • http://nuzavaxevarap.epizy.com/adding_mixed_numbers_practice_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c3f1cb0-ec05-4a9e-960c-eff62812cdfc/33911825450.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09c23043-9706-4a3d-bdb6-f68f15d5a7ce/romutipofax.pdfIn PDF document text
    • http://mepoketefetur.rf.gd/modern_business_administration_sixth_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8429151e-ff7d-431a-9d58-f921af554ec8/walmart_ps5_controller.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21d8d62d-f750-4cf0-b461-0d85be337e1e/fifty_shades_freed_filming_locations.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_off0000e645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE645 5316 bytes
SHA-256: ccf4ed8c50bb6b52790e214c8b82b0d008fdacf8a4c1b8e3c0091fb85aaea5d5
font_01_sfnt_off0000f83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83A 10472 bytes
SHA-256: 6db6b66b2cb5d064219e439aae7d0d153044961990d1dcc35ebc0a1520a4b38d