Malicious PDF — malware analysis report

Static analysis result for SHA-256 045b527ff4018b10…

MALICIOUS

PDF

82.8 KB Created: 2021-04-17 23:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b87023117d14f2d560c9c75923ad8da1 SHA-1: 21dd2408adae006d9afca6311b7d50ef39cb5557 SHA-256: 045b527ff4018b104fd7ffc4eec0e138106b895d59ddce304902ce8648f17b18
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 pointing to disposable domains, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/strik?utm_term=how+to+build+a+homemade+ice+cream+maker PDF link annotation
    • http://trychambre.xyz/how_to_pair_jbl_flip_4_to_iphone_56icn5.pdfIn PDF document text
    • http://help-service-support.com/xaxiposiziwivasagomuhxvqh.pdfIn PDF document text
    • http://nomiwiturej.getenjoyment.net/conformal_array_antenna_theory_and_design.pdfIn PDF document text
    • http://wowit.pro/268775639010tbix.pdfIn PDF document text
    • http://vumogegotawugub.mypressonline.com/aiag_spc_reference_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/notizejamebo/sDeijpG/pocket_door_frame_sizes.pdfIn PDF document text
    • http://topfrag.rip/que_es_un_editor_de_presentacionespa00w.pdfIn PDF document text
    • https://cdn.sqhk.co/melipetoluf/hhjNT1y/my_verizon_dsl_account_login.pdfIn PDF document text
    • http://maewallace.com/abecedario_para_imprimir_con_mayuscuq55v4.pdfIn PDF document text
    • https://cdn.sqhk.co/komajekolino/3ievSje/20115353386.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://5c09c65f-4728-49e3-9562-8692e696fc4f.filesusr.com/ugd/32acb1_34a9233ce77a43e3a0ad141e2c50c39e.pdf?index=trueIn PDF document text
    • https://50bf384a-eeac-4f26-a262-e2ba1a5e00ba.filesusr.com/ugd/17159d_a13404617bac41d1adb72c28bb153760.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6053878b-29eb-419f-b130-e424fbf7d798/tusivasawip.pdfIn PDF document text
    • https://314a97e4-cc7b-499c-a999-42b15fb65c39.filesusr.com/ugd/fa4a73_5dbe48e18e9446cfb7f0423a9cb3bf92.pdf?index=trueIn PDF document text
    • https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_5df636e382264ae0a54ffcd488015066.pdf?index=trueIn PDF document text
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_20d191bb3fd64e589f7b1fcb21b6114f.pdf?index=trueIn PDF document text
    • https://de461234-8179-4892-b46d-67dc01ae00af.filesusr.com/ugd/69bbc5_354cadc317894ac694ce006d056d7bea.pdf?index=trueIn PDF document text
    • http://nibemodida.myartsonline.com/archinteriors_vol_47.pdfIn PDF document text
    • http://rizivubonulej.atwebpages.com/jafegakipezilekobo.pdfIn PDF document text
    • https://ec560393-4650-4708-bf0c-d08fceb8458c.filesusr.com/ugd/ca69db_9655ab6f6b9e4ddda044156272e627dd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/594e28ea-ff38-4904-ae68-381fb918aa77/lukel.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_off0000f9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D7 5036 bytes
SHA-256: 40ee8347ea78aaaaba2eb677e38810e9f7bfb943f87f2e9deb7f85f351e8237f
font_01_sfnt_off00010af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF9 10492 bytes
SHA-256: bf4d03df6e07d8734346e3247b3ba6b468b4d2840fa26dcf9f9e16a4cbc044a1
font_02_sfnt_off00012ed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED8 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e