Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0ffd79adfdd0d98…

MALICIOUS

PDF

77.6 KB Created: 2021-03-22 17:35:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e80691c638376962caaac46d510ee15b SHA-1: 28039924ab501bcc475d7af624f11b3487fab3ca SHA-256: c0ffd79adfdd0d982ba79158bd750c7ed7e5f0c1e27a6879f6aba36daaebe2bb
146 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a phishing lure and contains external URIs. The document body, though heavily obfuscated, contains text related to a book title, suggesting a pretext for the malicious links. The presence of multiple unknown reputation URLs points towards a distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://fokemale.ru/award?keyword=fundamentals+of+corporate+accounting+by+jr+monga+pdf PDF link annotation
    • http://mangalvpodarok.ru/abordagem_burocratica_da_administraowa4e9.pdfIn PDF document text
    • http://jagiliwut.22web.org/alt_balaji_subscription_hack_apk.pdfIn PDF document text
    • http://drovazvenigorod.ru/zemevotipiwumigekipavqygak.pdfIn PDF document text
    • http://buybritishcat.com/gogadutimidekaru3c60d.pdfIn PDF document text
    • http://studytogether.fun/vedewapqhe6.pdfIn PDF document text
    • http://pitowiragomiwa.22web.org/tiriremonidanataxobito.pdfIn PDF document text
    • http://wiwafapudipib.iblogger.org/51288633734.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/22fb60ac-cb33-47ae-a033-81f0fd81d485/what_happened_at_the_end_of_chapter_21_in_to_kill_a_mockingbird.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d802c042-6b95-4878-82ca-00c84d4d230e/83546373475.pdfIn PDF document text
    • http://derekage.epizy.com/australian_aboriginal_history.pdfIn PDF document text
    • http://fejuzezoj.epizy.com/murumekelederodop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab142f65-4279-4652-9a67-b661a0d3dfc7/73291994061.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd89f37f-e0d3-4524-8b18-b1e247d07121/the_three_billy_goats_gruff_golden_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43457f67-ad41-49f4-9300-e442c3d3eca4/zekepisetenexapaneb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a89e6bd-210f-4687-ab1c-93d49e7e2e9a/58349321941.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed9dfb63-f80d-4549-b47d-3e064eae1150/37830923637.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b345aa83-4f23-4e91-b1c8-4021445c22b3/98716955356.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b5910bc-03ba-43b8-9568-03ce455dfa3c/lanodajavusexowomatuno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/570c7bb2-6ebe-4a5b-bf9e-c3f3f5ded941/define_evolutionary_theory_in_government.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f79310e5-2dff-4cb9-a6e8-3d75852bc1b5/transformational_leadership_in_nursing_pros_and_cons.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3dc78e4-0c83-4aad-9564-f3c3367e8d43/kodejajajizufen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82a98956-2832-488d-bfe0-cee09e45f2f2/kofuwawo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18aeb906-34db-48ba-b37f-116b289404bf/suntrust_bank_payoff_address_nashville_tn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fbc2622-20c1-4054-9c0a-2ed212147781/can_you_take_the_written_driving_test_online_in_michigan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c55f0a54-945b-4b02-948e-2ca13b307ff4/how_to_replace_chamberlain_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a296891-dcb7-4fb7-91cb-8da31b4fc1f7/caracteristicas_de_las_revistas_de_divulgacion_cientifica_para_nios.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD970 5748 bytes
SHA-256: b66961aee9dd2aaa8dacdeb0ae0a2cb51eb59fae2540607f753fbdd2c66063d6
font_01_sfnt_off0000ecfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFD 10940 bytes
SHA-256: c3c113f19e56d9c4cbcb46ae3e63110e34e3584bca5e829f6cb00bad1ee4e024
font_02_sfnt_off00011242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11242 16164 bytes
SHA-256: 4bd16c8abd39118228c1571b0005d4eb3b3e943e572fd92a2a80cfcb7b749349