Malicious PDF — malware analysis report

Static analysis result for SHA-256 489364f915c37dad…

MALICIOUS

PDF

73.5 KB Created: 2021-03-05 18:07:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 6c5e59c3a4341155175e12888f0f43d7 SHA-1: 589c430c108ff1446222500332495bd97c1eeca5 SHA-256: 489364f915c37dad61c075e5612bcc8503ddaa00da3c57f8952e6a77535553a3
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified by heuristics as a link farm on disposable hosting and flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'web lesson cloning answers', indicating a phishing or malware distribution attempt. No scripts were extracted, but the presence of external links and high detection scores strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jumiwimov.ru/wix?keyword=web+lesson+cloning+answers PDF link annotation
    • http://sakulog.sportsontheweb.net/what_are_marketing_strategy_process.pdfIn PDF document text
    • http://tojanulisito.iblogger.org/firebase_api_key_android.pdfIn PDF document text
    • http://xufamorazogubov.sportsontheweb.net/how_to_use_keurig_mini_descaling_solution.pdfIn PDF document text
    • http://tepugorotewole.medianewsonline.com/bowanedukiwubitebuxorud.pdfIn PDF document text
    • http://rexonina.medianewsonline.com/75042538872.pdfIn PDF document text
    • http://lofajemami.sportsontheweb.net/53201619271.pdfIn PDF document text
    • http://lulopoboxefon.scienceontheweb.net/91021894426.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://s3.amazonaws.com/donukadizolin/bhaskara_1_information_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e42e731-5179-431f-b671-3c2d20dd00dd/20834507391.pdfIn PDF document text
    • http://muferipimakolop.rf.gd/pioneer_sph-da120_wont_turn_on.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/printable_august_2019_calendar_template.pdfIn PDF document text
    • http://naxebobowarado.epizy.com/how_to_use_hoover_steamvac_spinscrub_attachments.pdfIn PDF document text
    • http://xolalujodijosox.rf.gd/scratch_card_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb605e7f-124b-495d-a57e-f6c8cc199313/67533843364.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b18e7d9-28a3-41e9-9299-dce6f832be03/what_does_god_say_about_loneliness.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51425c72-4115-4fa7-aa7d-ff5cdb408e00/basic_electronics_course_syllabus.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/80414567598.pdfIn PDF document text
    • http://ruruwuvatokatal.onlinewebshop.net/the_fallen_quest_skyrim_walkthrough.pdfIn PDF document text
    • http://finabupotokuko.epizy.com/48948223344.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/15630124853.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/wafagogeneluwoxarosuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbfdce71-ec8d-415a-aae7-aabcfd42925d/occupational_outlook_handbook_is_updated_every.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/463203cd-2aab-4100-bdd9-47f28986dadc/tl-wr841n_openwrt_repeater.pdfIn PDF document text
    • http://learn.genetics.utah.edu/In 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_off0000d732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD732 4920 bytes
SHA-256: f64e44731f120f48376d5dc505736b84661581af6bb3bed2bea7960425836f9b
font_01_sfnt_off0000e801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE801 10132 bytes
SHA-256: 6f8bc36cd11659bfea3d477d3681dd4042dd90738dc0aeecce1babc3692b3247
font_02_sfnt_off00010aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA2 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3