Malicious PDF — malware analysis report

Static analysis result for SHA-256 afb6e0abeae9a5c2…

MALICIOUS

PDF

83.4 KB Created: 2021-05-18 23:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 125eafb1f643e93c0c2ac947610d0707 SHA-1: 8bf46ecdf640a043489d8e20c84df2acf6b79df9 SHA-256: afb6e0abeae9a5c21d9eb1ea3731568a2182a33d30d6c45922778036646f3c9c
184 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=what+does+guided+reading+level+f+mean In PDF document text
    • http://negeduji.66ghz.com/86037674296.pdfIn PDF document text
    • http://biteroz.iblogger.org/momentum_physics_cheat_sheet.pdfIn PDF document text
    • http://limevekobo.iblogger.org/71796558546.pdfIn PDF document text
    • http://wizinisiko.iblogger.org/34175618728.pdfIn PDF document text
    • http://julidixove.22web.org/becker_cpa_far_2020.pdfIn PDF document text
    • http://fibubomalinod.22web.org/42333181467.pdfIn PDF document text
    • http://xesukifogenabe.iblogger.org/88578173879.pdfIn PDF document text
    • http://lusoxokurutugap.22web.org/gozofinaro.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/gazijewevan/baidu_browser_er_not_working.pdfIn PDF document text
    • http://loxototo.epizy.com/ftc_buyers_guide_fillable.pdfIn PDF document text
    • http://kujarison.rf.gd/zagepufazilanepapuzawazi.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/salosowebanezuzinul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0c28ac8-6400-4d9e-910b-58542f0c1e81/centech_60794_price.pdfIn PDF document text
    • http://jipegutakaxe.rf.gd/86622927076.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/227fefe2-6b70-4685-91f4-d908786fe209/77844681568.pdfIn PDF document text
    • http://wotixebapaxuwug.rf.gd/logokupupar.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/d3_baseball_playoff_format_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e270a88-bbe8-4afe-ade0-65a7e9482e73/80132344801.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/503caa1e-2167-4e73-a75c-81f233f2957c/project_management_institute_membership_verification.pdfIn PDF document text
    • http://giwaxavuf.epizy.com/soladesepirojudixuxilapa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dab03db2-6750-4e63-8c22-6ce02892bab7/71589759472.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/260cec69-3a5f-43b3-8dda-a4f7035fd663/birthday_cake_online_booking_in_mumbai.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/68570704082.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/17118730930.pdfIn PDF document text
    • http://bipitor.epizy.com/51157702927.pdfIn PDF document text
    • http://nodegopoxomo.epizy.com/definition_of_business_ethics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64f8deaf-99f9-42a5-956f-d77b2ae7be4a/how_to_build_conflict_management_skills.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e11a55f-388e-4154-9cb7-90653236d86a/facebook_saved_collections_public.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e5a2a62-2b58-442c-964a-1aaccf2df70b/2015_harley_davidson_touring_service_manual.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_off0000f9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CE 5276 bytes
SHA-256: 4aa3f9d8b0e3afd161507b1d66bd473de7c92697655bd14b685e7e72187cd9c5
font_01_sfnt_off00010ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA1 11264 bytes
SHA-256: 83fee7339f3a9e44e2c270aaac26f37839152f89363f882d22c2c57b1db6c76d
font_02_sfnt_off00013169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13169 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333