Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc2d81630a8b360…

MALICIOUS

PDF

81.4 KB Created: 2021-04-03 22:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f7e359661835ef61b1843a5a51b96ff SHA-1: 2fdce5163c0154da909eb47b7f15d099ab735e0e SHA-256: dfc2d81630a8b360a0a0f61cf27ce405d973f15c1b45e307cd432b304b08f94c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document is classified as malicious, exhibiting characteristics of a credential harvesting lure. The document body, though partially corrupted, suggests a pretext related to changing a lock code, which is likely a deceptive tactic to encourage users to click embedded links. The presence of numerous external URIs, many hosted on disposable domains, and the 'SE_MFA_LURE' heuristic strongly indicate a phishing attempt designed to steal user credentials or session tokens. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://golowaki.ru/strik?utm_term=how+to+change+code+on+kwikset+909
    • http://wordsideget.top/vufosagibugaxadugadotot19bk.pdf
    • https://nilozirarita.weebly.com/uploads/1/3/4/4/134463528/matodaxodabaj.pdf
    • http://kujotisokuvo.iblogger.org/how_often_to_replace_power_steering_fluid_honda_accord.pdf
    • http://kwini-fini.online/dreamville_sacrifices_instrumental_mp3_downloadouh89.pdf
    • http://litemado.iblogger.org/critical_thinking_skills_for_university_students.pdf
    • http://jegepev.22web.org/amazon_business_model_case_study.pdf
    • http://siondez.ru/how_to_make_a_large_dog_crate4nyil.pdf
    • https://komimarokobak.weebly.com/uploads/1/3/4/6/134604519/wupen.pdf
    • http://mafewagidimu.22web.org/glencoe_algebra_2_workbook.pdf
    • http://gladkoe-telo.xyz/sennheiser_xs_wireless_microphone_system740n3.pdf
    • https://xisilejawot.weebly.com/uploads/1/3/4/0/134016881/mijuxuni.pdf
    • https://jitavemalidev.weebly.com/uploads/1/3/1/8/131871699/2122948.pdf
    • http://servicesforsupport.com/ejemplo_de_carta_comercial_corta_en_inglesbmgkf.pdf
    • https://giburonolunege.weebly.com/uploads/1/3/1/4/131406036/retak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://potelodifudoduj.epizy.com/52801438024.pdf
    • http://rebivik.epizy.com/37095908780.pdf
    • http://baletax.onlinewebshop.net/free_crochet_pattern_for_granny_square_baby_blanket.pdf
    • https://uploads.strikinglycdn.com/files/727726b6-4a44-432e-94be-32613f9be759/how_to_train_your_dragon_2_characters_and_their_dragons.pdf
    • http://rolaxaja.rf.gd/zekumusiwiwoze.pdf
    • http://giwolexuki.rf.gd/83071457585.pdf
    • http://sevuvev.epizy.com/descargar_libro_caballo_de_troya_7_gratis.pdf
    • https://uploads.strikinglycdn.com/files/a13659d7-d0e8-468c-8f28-967e053150b1/32327403316.pdf
    • http://ludumidajite.rf.gd/canonical_form_of_pde_mathematics.pdf
    • https://uploads.strikinglycdn.com/files/29bb4d25-f788-4ecc-a831-57148222f07e/the_apology_of_socrates_download.pdf
    • http://kegigija.atwebpages.com/introduction_to_statistical_learning_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f31d.bin
3997eb203151d693b5fb60abdbde45b6d2263204ccc673e8163aaa661748ba62		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF31D 5276 bytes
font_01_sfnt_off0001050d.bin
25bb2b4e76b7d6af6efd57e7877d6a236d10e0bee209846e307dd51296ddd56b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1050D 10432 bytes
font_02_sfnt_off00012860.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12860 4324 bytes

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