Malicious PDF — malware analysis report

Static analysis result for SHA-256 43de6d865e5d4822…

MALICIOUS

PDF

75.9 KB Created: 2021-04-30 13:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ebcf7c518b54e39502d07b324c35b07 SHA-1: 2a90a895713c214216e8a716b1fde424a6555b8b SHA-256: 43de6d865e5d48229d7668bd2f3f02b31681f81dd3f1c7d4b53d5266195cf706
96 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan and a machine learning classifier. It contains an embedded URI pointing to a suspicious domain, 'seumenha.ru', which is likely used to host malicious content or redirect users to a phishing site. The document body is heavily obfuscated, but the presence of the external URI and the high risk score indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=texas+gdp+vs+russia
    • https://cdn-cms.f-static.net/uploads/4495849/normal_604d6aed402a6.pdf
    • https://cdn-cms.f-static.net/uploads/4416671/normal_604b09343c033.pdf
    • https://cdn.sqhk.co/pevedapev/fheVgjM/baby_fetal_weight_by_week.pdf
    • https://cdn-cms.f-static.net/uploads/4499935/normal_602aa3c1efcf2.pdf
    • http://xaraxag.mypressonline.com/10721033111.pdf
    • http://guronid.mygamesonline.org/gre_argument_pool_answers.pdf
    • https://cdn-cms.f-static.net/uploads/4413977/normal_6038465db2637.pdf
    • https://cdn.sqhk.co/wuxobilan/hgf1rhc/83321257732.pdf
    • http://ponaxamewimenul.sportsontheweb.net/jowoxotoruvopujufofow.pdf
    • https://cdn.sqhk.co/pofoxubo/1OkhjYq/drift_max_pro_unblocked.pdf
    • https://cdn.sqhk.co/tipefimex/ftieiib/race_car_merger_mod_apk.pdf
    • http://punejew.mygamesonline.org/39820683907.pdf
    • https://cdn.sqhk.co/tezofifevag/egfgihd/abacus_alarm_system_manual.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/630dd3d0-f8d7-42a4-b83f-63a4db6d5dac/how_to_scan_on_dell_e525w_printer.pdf
    • http://noroved.myartsonline.com/jozujufu.pdf
    • https://s3.amazonaws.com/ninazarila/adding_unlike_fractions_worksheet_grade_4.pdf
    • https://uploads.strikinglycdn.com/files/b19f8cff-7d9e-443d-806e-50d8faa4512d/samsung_un32n5300afxza_stand.pdf
    • http://zisukuvi.atwebpages.com/what_is_the_purpose_of_the_armor_of_god.pdf
    • https://uploads.strikinglycdn.com/files/2498a917-61d9-4070-8bc3-bb3742bf8096/krups_beertender_tubes.pdf
    • https://s3.amazonaws.com/divelatoxa/duwodobajob.pdf
    • https://s3.amazonaws.com/fadobirak/aliments_riches_en_calcium.pdf
    • http://faxevimisosideg.myartsonline.com/80025015991.pdf
    • https://uploads.strikinglycdn.com/files/7446d6d3-7dae-4cb1-9004-93ccceef0321/kitchenaid_artisan_stand_mixer_blue_velvet.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed07.bin
5656e9627ced44e5c5b04f4cb23d652276198f568de1099877f67b34a98dc031		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED07 5172 bytes
font_01_sfnt_off0000feb8.bin
59e0d48a698e90e1b04dc8623c2ab7c25b100936a213f4908b5eb4841477299b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB8 10428 bytes

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