Malicious PDF — malware analysis report

Static analysis result for SHA-256 396bb87e2fe09274…

MALICIOUS

PDF

80.0 KB Created: 2021-03-08 21:54:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: de9623526200f5bea0576d60bccc736d SHA-1: 473480b34adddf7dcc761ec4579a9d2c46a416c7 SHA-256: 396bb87e2fe092749c766f9ef012884a2fd611764e4d294b344e30eb0fc1c38d
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 ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristics point towards it being used to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/strik?utm_term=troy+bilt+382cc+riding+mower+for+sale PDF link annotation
    • https://cdn.sqhk.co/wujejelot/ghxgina/get_perfect_turnout.pdfIn PDF document text
    • http://cccckkkkkdd.space/govasorijijivilodotexowun57bao.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/icTYGHR/modern_strike_multiplayer_fps_critical_action_apk_mod.pdfIn PDF document text
    • https://noxagutut.weebly.com/uploads/1/3/4/4/134483949/xanitebozopote.pdfIn PDF document text
    • http://kleomaften.online/64063713213owwbg.pdfIn PDF document text
    • http://intereriia.com/stihl_ms_150_tc_best_pricemloum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365594/normal_601b69a8c3391.pdfIn PDF document text
    • https://batapasupo.weebly.com/uploads/1/3/1/4/131482803/fefizilokutemena.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443574/normal_603e4efcdce7c.pdfIn PDF document text
    • http://logoped-samara.ru/thoreau_walking_full_textjf9h9.pdfIn PDF document text
    • http://lazadacostumercenter.com/charge_sheet_section_crpcwgdtm.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://uploads.strikinglycdn.com/files/1f5ad575-46b7-4f75-8720-e5aefafaa098/best_stocks_to_buy_today_under_10_rs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbf4b41d-3225-440c-a99a-194bc6d4c806/bushnell_telescope_voyager_model_ak-78-9565.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/580663ba-d848-4a66-944d-acf2a625aad7/prioritization_delegation_and_assignment_4th_edition_test_bank.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1215dd6a-06fb-4d4d-bc05-505988fe2c47/37393086673.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70be9a25-1b29-4961-bed4-29e7eb8485d7/kitchenaid_refrigerator_repair_service_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2878ef49-6c94-4546-a16d-088045a1686b/does_sora_exist_no_game_no_life.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1019c7d0-25f5-4100-be65-54c77d19c41a/63237614014.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_off0000eb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB93 5900 bytes
SHA-256: 7cfe239dae4a001ad4f4e1d751c7a09c14c1f1b5dfa52dacde1746d932487974
font_01_sfnt_off0000ff9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9C 10812 bytes
SHA-256: 640f4610ce3a4714d0e22a2b038ba1489ef2ee28ed7894cf4a0becc26b3934fa
font_02_sfnt_off000124bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BC 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176