Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f288297182f15ff…

MALICIOUS

PDF

88.0 KB Created: 2021-04-01 08:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 41f2a1aa05080d9d3d791c16886d6db7 SHA-1: ff586759fa97b771448f5427003bb3d8536c4aab SHA-256: 3f288297182f15ffb3290593ad64e03d6f2f3bdd332380af9bf80298261728ba
186 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to disposable hosting, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a large number of external links, with some pointing to potentially malicious or untrusted domains. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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=how+to+get+a+driver%2527s+learner%2527s+permit PDF link annotation
    • http://tifusavegapawuf.mygamesonline.org/regazowuke.pdfIn PDF document text
    • https://jikigalogadod.weebly.com/uploads/1/3/4/6/134647375/robulukarasow.pdfIn PDF document text
    • http://wovoradomumakil.medianewsonline.com/how_do_i_change_the_time_on_verifone_vx520.pdfIn PDF document text
    • https://kiluzamomumu.weebly.com/uploads/1/3/5/3/135344913/sujixop_zavagamid_siwazija_zepujoxi.pdfIn PDF document text
    • http://dvestideyli.xyz/xemafoodal.pdfIn PDF document text
    • https://risimukino.weebly.com/uploads/1/3/1/3/131383953/bcd9d5654aab213.pdfIn PDF document text
    • http://save50it.pro/50729011547efjpp.pdfIn PDF document text
    • http://jizerigozigalav.getenjoyment.net/22658358636.pdfIn PDF document text
    • https://feposogasutam.weebly.com/uploads/1/3/1/3/131384530/jedarowagili.pdfIn PDF document text
    • http://idealsit.fun/59311697397pedl1.pdfIn PDF document text
    • http://lumobumekola.getenjoyment.net/83921138049.pdfIn PDF document text
    • https://vedefagam.weebly.com/uploads/1/3/0/8/130814874/dogekijebetase_mowijuwolofu_marag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nejexapef.rf.gd/bruce_lee_film_enter_the_dragon.pdfIn PDF document text
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_cea4affb6ad54ee2a3d12776209eaa9a.pdf?index=trueIn PDF document text
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_04b1a47fd91e446fb7b26b14e339f538.pdf?index=trueIn PDF document text
    • https://ececae0b-1312-4a4c-959a-117928b3d478.filesusr.com/ugd/e6721e_ead3c69cd43f4b8bb2b4ce9027cee6dc.pdf?index=trueIn PDF document text
    • http://riludades.epizy.com/math_coloring_worksheets_5th_grade.pdfIn PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_d9c8484537754ad98613a4f7918c0907.pdf?index=trueIn PDF document text
    • http://makovetesilo.rf.gd/java_machine_learning_tutorial_for_beginners.pdfIn PDF document text
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_794d1edd707841e7abdfde145deda2e7.pdf?index=trueIn PDF document text
    • https://88966db1-4a83-4446-b941-f65022a6235f.filesusr.com/ugd/928e0f_7431ad5ae0c549c294e61ab08659e1ef.pdf?index=trueIn PDF document text
    • https://761e60ea-5e0e-4c43-b4c2-f6a9045c608d.filesusr.com/ugd/545033_7e6a0a6667574cb980414dba01228c77.pdf?index=trueIn PDF document text
    • https://8aefc570-8454-48c3-bb63-d4d1067b7ce0.filesusr.com/ugd/5c9621_27d9af7b45404d569a6b2330e02616bc.pdf?index=trueIn PDF document text
    • https://e6676b24-921d-4f57-8fca-beda98688f3c.filesusr.com/ugd/144d27_a07c97e63b664b63a29e9b3394b8e766.pdf?index=trueIn PDF document text
    • http://vefelazubogimew.rf.gd/dan_brown_complete_book_list.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11413 5424 bytes
SHA-256: a34dcd94291cdbdf42f619079b2ea4ead07adf29d0cf30d0f789c65d2bf631de
font_01_sfnt_off00012699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12699 12916 bytes
SHA-256: 17d4554a69d48c1406d3f86f52c85f1261a586adeb2452ebf4ee20885dc5e035

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