Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bf12494975f8a5a…

MALICIOUS

PDF

81.1 KB Created: 2021-03-17 03:27:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 463a0777116794d8e7a3c96e8048a3cf SHA-1: bc8b28ee2b433ba26c1d1421adb1df6324493f03 SHA-256: 6bf12494975f8a5a04e39093dc4fc28da269c2e579586738ed18dec79ec42f7a
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The SE_INVOICE_LURE heuristic suggests the document's content is designed to trick the user into clicking these links. ClamAV also detected this file as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and extensive link farm suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://midufefew.ru/award?keyword=accounting+basics+tutorials+point+pdf
    • http://timinome.getenjoyment.net/3706338708.pdf
    • https://tuwebuliwarukor.weebly.com/uploads/1/3/5/4/135400964/rabivaf_raratigometukod_julukosujibez.pdf
    • https://nuvefozilif.weebly.com/uploads/1/3/4/7/134733792/ca5be0220.pdf
    • http://paxabak.mypressonline.com/patronage_politics.pdf
    • https://gumakini.weebly.com/uploads/1/3/1/4/131414358/6915926.pdf
    • https://zosagejezigim.weebly.com/uploads/1/3/4/7/134709887/gimiwi.pdf
    • https://tuxinotem.weebly.com/uploads/1/3/4/8/134883911/2d71177.pdf
    • https://bitugibetofovo.weebly.com/uploads/1/3/0/9/130969362/1844520.pdf
    • https://vawosikajoj.weebly.com/uploads/1/3/1/4/131438279/pulifivejofifadarep.pdf
    • http://zurujavurobe.scienceontheweb.net/britten_war_requiem_score.pdf
    • https://gesojotumone.weebly.com/uploads/1/3/4/6/134614539/sunor.pdf
    • https://vanuludegevu.weebly.com/uploads/1/3/0/7/130776818/tabuvofesemobagixod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mojivikapeti/chapter_6_inventory_control_models_answers.pdf
    • https://uploads.strikinglycdn.com/files/ad088954-c38d-4e09-9009-91a5e159aa10/logitech_harmony_smart_control_universal_remote.pdf
    • https://uploads.strikinglycdn.com/files/eaa0f030-3e43-43ab-9fe0-783cbbd8743b/elementary_linear_algebra_9th_edition_solutions_online.pdf
    • http://rabatelekovufar.myartsonline.com/toletezagu.pdf
    • https://s3.amazonaws.com/kujesulad/leshan_buddha_sheet_music.pdf
    • http://degevojorak.myartsonline.com/cambridge_igcse_business_studies_4th_edition_workbook.pdf
    • https://uploads.strikinglycdn.com/files/df47645d-18a5-4d99-8b58-d2be8f33dbb7/will_gta_5_ps4_disc_work_on_ps5.pdf
    • https://uploads.strikinglycdn.com/files/61382078-9a39-419d-a57e-da326dac7421/rimava.pdf
    • https://uploads.strikinglycdn.com/files/d7660331-5be2-4cb1-8437-ea19f7139fd7/1_hectometro_cuantos_metros_son.pdf
    • https://uploads.strikinglycdn.com/files/3d8d221e-674c-438e-b0f1-76fe0b21b951/did_they_take_pretty_little_liars_off_netflix_2020.pdf
    • https://uploads.strikinglycdn.com/files/3e3fac75-a00f-440a-b5db-03f1322bf454/omron_bp785n_10_series.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_off0000fddb.bin
78e0ae722314775f9a17bbc5cd91b305dedb75a92445e5b893b21291c8ae87c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDB 5452 bytes
font_01_sfnt_off00011070.bin
396df70a0bca072575cfa775cb357077058c6b1b18455a8c59ec2928611ef45c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11070 11188 bytes

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