Malicious PDF — malware analysis report

Static analysis result for SHA-256 54c8afc63039fb25…

MALICIOUS

PDF

84.8 KB Created: 2021-05-18 01:39:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2b5379a597438a15be83158b8ab10c39 SHA-1: 3cd39f63d8f3b2102fb7c153f45f6fe1d32b71a0 SHA-256: 54c8afc63039fb252bf99ec018a7972c04ed9996aeab662d759613c20a68a2ce
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. 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 techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

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
  • 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.
  • 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://jacksth.ru/strik?utm_term=high+protein+low+carb+vegetarian+indian+foods PDF link annotation
    • http://xukugolipanizo.iblogger.org/candy_camera_app_for_pc.pdfIn PDF document text
    • https://kobetuditi.weebly.com/uploads/1/3/4/4/134446504/jojikik_xalududonat_kulinowov.pdfIn PDF document text
    • https://wofirifitobad.weebly.com/uploads/1/3/4/3/134310136/bddcadd5.pdfIn PDF document text
    • http://kogiwonewaveg.iblogger.org/lavepagutalamexobefirezap.pdfIn PDF document text
    • https://giduwuxudi.weebly.com/uploads/1/3/4/7/134716719/topumowifozoj-buzenepada-jipisilipirawab.pdfIn PDF document text
    • https://likizosuzi.weebly.com/uploads/1/3/4/8/134886942/dofepatadimuf_papupanizovol_defusidoko.pdfIn PDF document text
    • https://zubowosusotikip.weebly.com/uploads/1/3/1/6/131637009/piloz.pdfIn PDF document text
    • https://jujodupif.weebly.com/uploads/1/3/2/3/132303189/6955105.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
    • http://wokezafuvix.epizy.com/fda_supplement_labeling_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/665a6759-cc0b-4375-adf2-71ebad1e30b7/vocabulary_workshop_level_b_unit_7_choosing_the_right_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0832e9e-862f-4d3f-a3e0-87703e4417ea/68030820717.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/633bf0ce-1a1a-4fa0-a0cb-2cc45e1fd161/romogusi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f638b1c1-0042-43d4-b67d-250758cd9193/41584161076.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e065c0d-6f3e-462d-9d14-8e1e1d849b39/aeronautical_engineering_colleges_in_mumbai_fees_structure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b014f30d-fda1-4625-9ed9-81028e1b80a0/how_to_fix_vitamix_drive_socket.pdfIn PDF document text
    • http://jemejuzot.epizy.com/65155900261.pdfIn PDF document text
    • http://tilixufevoj.epizy.com/anaconda_ubuntu_16.pdfIn PDF document text
    • http://notovagewalarin.epizy.com/41036133842.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c784636d-0cf4-4b9f-9561-ad3d7cfcac44/30781881432.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6495d7b5-a43a-4892-a645-ff2915ce33c1/can_you_program_a_garage_door_opener_to_open_a_gate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/943ef700-332e-4bad-a785-cd8045676681/vitoxosevodu.pdfIn PDF document text
    • http://vugixemavofagen.epizy.com/contoh_rpp_k13_sma_biologi.pdfIn PDF document text
    • http://nanaxaj.rf.gd/dovagorenegox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96a28549-031d-48d4-b2b2-d2238051882a/nodakojobedutokelidipej.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA4 5456 bytes
SHA-256: 2643b023b473efd9593722e03a2d04c1780be52066b44a35a750436ea5f871de
font_01_sfnt_off0001103c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103C 11520 bytes
SHA-256: 11ef2484c955b05acd3c40e0b0ffb5e2cc3f8487cd3b250a54c798aec156cc91
font_02_sfnt_off00013722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13722 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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