Malicious PDF — malware analysis report

Static analysis result for SHA-256 d79de9b07f3370af…

MALICIOUS

PDF

77.6 KB Created: 2021-03-31 04:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 74319c42848c8fc01fcc1cd7385accc4 SHA-1: 10ef4e63ab2b57dab9fa1bf970f6af05e8246761 SHA-256: d79de9b07f3370af6dc30c6877bc9715ef2c8e2d9e2eafed05916903d788328b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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://jumiwimov.ru/strik?utm_term=give+me+liberty+chapter+19+review+questions+quizlet PDF link annotation
    • http://filemarker.store/6342664206ighhr.pdfIn PDF document text
    • http://wurilozi.scienceontheweb.net/stp_segmentation_targeting_positioning.pdfIn PDF document text
    • http://findfreegirl.com/night_owl_security_cameras_setupko35m.pdfIn PDF document text
    • http://toppiksnack.xyz/khadya_parchi_mpwk9rc.pdfIn PDF document text
    • http://aduo5.online/lisipixaguvi09ji3.pdfIn PDF document text
    • http://adminhalil.com/brother_knitting_machine_instruction_manual_kh830vmajp.pdfIn PDF document text
    • http://namedaun.fun/631398104037htd6.pdfIn PDF document text
    • http://theandyhong.com/altivar_71_drive_user_manual9ig7g.pdfIn PDF document text
    • http://mrt-64.ru/kapazotidudenujulovopesujksnwr.pdfIn PDF document text
    • http://ruvinowuge.scienceontheweb.net/hedonistic_utilitarianism.pdfIn PDF document text
    • http://opensoda.pro/xifipezegelzziwy.pdfIn PDF document text
    • http://osummer.space/gravitrax_starter_kit_targetlkd8f.pdfIn PDF document text
    • http://akvatehnika74.ru/is_code_for_pervious_concrete_mix_designvuske.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wozoxub/fawoxemufifagugosularokin.pdfIn PDF document text
    • https://781b76d0-895c-4d4e-90f3-491762fad171.filesusr.com/ugd/894952_94ff431dd4d84924af43c7fda15a8b89.pdf?index=trueIn PDF document text
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_311dce7e570648cea95eff11fa5ee122.pdf?index=trueIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_0545c01663994cadba5c33e2edc1ed11.pdf?index=trueIn PDF document text
    • https://e7f45dcf-1957-410e-85b1-216e85a225c4.filesusr.com/ugd/a2c2bc_1cc4ce0c68b049d599540f79d92f892e.pdf?index=trueIn PDF document text
    • http://kifesafijupesob.onlinewebshop.net/20508867374.pdfIn PDF document text
    • https://b18ac5c8-c825-4c59-a0a1-290c879ce4f6.filesusr.com/ugd/1a0fde_9259746b338743e8864f1a21db6162ac.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/cornell_note_taking_method_template_microsoft_word.pdfIn PDF document text
    • http://desejole.myartsonline.com/xivizefaxuripivab.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_off0000e4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DE 5984 bytes
SHA-256: 9afe8519708f577c1f78a222cb3984a8d7ac78af206e35290f1485fbfea72b20
font_01_sfnt_off0000f92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92F 2464 bytes
SHA-256: a4819ace0c68aea95bbe756288e19462c7f99d9feecd8c208b1fc591cd21e6da
font_02_sfnt_off0001040b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040B 10516 bytes
SHA-256: 92e7df912dd96af641709211f20013e249313126b2e4e4b0f824298b5f71fe4c