Malicious PDF — malware analysis report

Static analysis result for SHA-256 44df63e01fcb409b…

MALICIOUS

PDF

81.1 KB Created: 2021-04-29 13:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 3dd9b132eb426576940abd5e634a1962 SHA-1: cf573d2d8285448de65d0decce3adb2b19135a89 SHA-256: 44df63e01fcb409bba2397e51e29a64111db8b09af0677ad56d44ff3951e1679
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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 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://seumenha.ru/strik?utm_term=no+game+no+life+manga+volume+3 PDF link annotation
    • http://zutatowatipo.mywebcommunity.org/brahmastra_math_book.pdfIn PDF document text
    • http://balegetiwep.mywebcommunity.org/arietta_edvard_grieg.pdfIn PDF document text
    • http://nopotaz.medianewsonline.com/cae_advanced_gold_exam_maximiser_with_key.pdfIn PDF document text
    • http://dikegebe.mygamesonline.org/all_in_one_english_communicative_class_10_download.pdfIn PDF document text
    • http://dimabigeteg.iblogger.org/2006_nissan_sentra_check_engine_light_reset.pdfIn PDF document text
    • http://zereteleriw.getenjoyment.net/poxegebotiruvasevapaf.pdfIn PDF document text
    • http://wififej.mypressonline.com/behavioral_objectives_in_filipino.pdfIn PDF document text
    • http://siwivelijutore.medianewsonline.com/37343593677.pdfIn PDF document text
    • http://sunazeremitiwu.mypressonline.com/64608932654.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/48af7d7a-2f2e-4ac8-9499-73ba29aa3f75/fekinegujok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf18dff2-5b9d-46b6-8096-025cae1f5cb0/iso_9001_internal_audit_training_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db81cc40-96bd-4631-8078-cedb378e0869/guzusitofopoxelufofagiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4034a8c-b7a4-4970-93d0-c9dbdef169b8/refowipajomexupapo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c640a6a2-c171-4331-a329-ce8b4eb530b7/futunodegodaxaxedaxodukav.pdfIn PDF document text
    • http://saninov.epizy.com/bugugisabokapomoxuxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35292d8a-6a4e-4407-92b3-15413a57a706/pumufaxoximiselokijumu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59cd4dd3-33fb-4456-9b46-5e35b228372a/what_does_the_pin_symbol_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dd6b8f2-5a08-4d63-8f0b-0f03db0e7728/53082748483.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a99c7096-7f09-432f-8173-9ee2a477940a/geometry_two_column_proofs_worksheets_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ac7baa4-3bd3-47ac-86d5-26371223baaf/how_to_create_a_workout_plan_in_excel.pdfIn PDF document text
    • http://vagilamiporaw.epizy.com/xuvudosikevejigi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbb0395c-26cc-4431-8dcd-e53fbca589d1/sole_f80_treadmill_price_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e24be067-40a5-4491-8622-3204417ee0e0/how_many_carbs_are_in_wendys_spicy_chicken_nuggets.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_off00010081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10081 5004 bytes
SHA-256: 1a40ea73f56299ad8c12b6b12948dda72f55bdb06dc23943dd534a7e296de687
font_01_sfnt_off0001119a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119A 10988 bytes
SHA-256: 8052d0aec033820f03661fe55650028ae91e1e3c365afba6c52b474219ce7e23