Malicious PDF — malware analysis report

Static analysis result for SHA-256 687160c776ea5d5c…

MALICIOUS

PDF

77.1 KB Created: 2021-04-23 14:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3430d7d04217aee9428a996946850a75 SHA-1: ab6a05a5e3e40b3c37235ac0cec3e3e6f34378be SHA-256: 687160c776ea5d5c087534ef47ee80b97e0603d1c268ea2104c9d8d18619d789
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used in SEO link farms to manipulate search engine rankings or redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing and trojan activity. The embedded URLs, such as 'https://kuzutuzo.ru/strik?utm_term=thermador+range+error+code+f1', suggest a phishing lure related to appliance error codes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=thermador+range+error+code+f1
    • http://sejerodetupumil.medianewsonline.com/62111520345.pdf
    • http://unlockdeals.shop/true_love_quotes_in_hindi_sad84j8a.pdf
    • http://my-favshopd.online/mitologia_griega_para_nios_medusaiodlm.pdf
    • http://gopubewigofopa.iblogger.org/barbell_back_squat_correct_form.pdf
    • http://winoorama.fun/composite_rectilinear_shapes_ks23t51c.pdf
    • http://vekisonoloze.sportsontheweb.net/yamaha_dgx_660b_specs.pdf
    • http://runolive.com/63734785164rtxb4.pdf
    • http://vapokox.22web.org/what_does_i_paint_houses_mean_in_the_irishman.pdf
    • http://tokepefanoxite.22web.org/kagan_cooperative_learning_strategies.pdf
    • http://maxist.ru/mexapm2dc4.pdf
    • http://kevekozulanilim.sportsontheweb.net/516574322.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cdc67411-1225-4379-a77e-f0c31247da86/how_do_i_check_my_address_for_pge_power_outage.pdf
    • https://abe99a74-823b-4c5d-85d6-f8d8de52422f.filesusr.com/ugd/73cc63_54b3d46861b54b56a06690b99d5f8814.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c7d5106a-27c6-44ea-89cd-28f7c80775cf/5e_campaign_books_ranked.pdf
    • https://uploads.strikinglycdn.com/files/7cb13648-b6be-4852-9a6e-457d27c3bc6c/how_to_cook_3_cups_of_rice_in_microwave.pdf
    • https://8e12fe21-47c1-448c-af9e-883e7c84523b.filesusr.com/ugd/52ac5e_a65ed803453844d4a16285d68066ff6a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9d82d98a-31d5-4a76-99b6-48a2ae065a1a/75249335013.pdf
    • https://e028ba52-6c86-493e-86b7-fecf7cd1c3eb.filesusr.com/ugd/bcb9fd_19f0bdc566b5438ebd2205150fbc8720.pdf?index=true
    • http://xepanagul.rf.gd/99369069910.pdf
    • https://uploads.strikinglycdn.com/files/080874a0-6128-40e2-a744-d4f4d8077039/fezaxujavimimusogifam.pdf
    • https://uploads.strikinglycdn.com/files/cb516dd2-37ff-427a-8d40-899a9acfdb4f/3_definiciones_de_economia_de_diferentes_autores.pdf
    • https://uploads.strikinglycdn.com/files/c01d2ad3-3448-4deb-bb93-31c7057bb5fa/what_kind_of_oil_does_a_4.0_jeep_cherokee_take.pdf
    • https://uploads.strikinglycdn.com/files/08f67428-52ed-4b34-ae77-7fac133ecc14/jawulawakivekusuv.pdf
    • https://68358877-4ee6-4e53-94f7-4bd9665c1f53.filesusr.com/ugd/3bbd68_dfadcedea1ce4ba9834b8bc85e38bed8.pdf?index=true
    • http://kanuximus.rf.gd/converting_litres_to_ml_worksheet_ks2.pdf
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_6f1aad83a4684130b6a3410597b866e3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/14d44f79-fda6-42e9-8d0f-fd0346b55c50/lanorifezupaxesosozunul.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f108.bin
4636d0c6eb7e7308c5babea3de50d439b4f056fc117066f8a4a9f3830bdf1975		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF108 5224 bytes
font_01_sfnt_off000102a7.bin
26161220deaf16892385a7f781b9c73ece6f6da8e76e467a0a9ab68cd6780a2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102A7 10728 bytes

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