Malicious PDF — malware analysis report

Static analysis result for SHA-256 862bdd75056841f2…

MALICIOUS

PDF

81.9 KB Created: 2021-03-09 07:56:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: c488cc55a7d392dcee35a30781d5f6f9 SHA-1: 942f4ec4a647de393f901b9d3157db0484c9619c SHA-256: 862bdd75056841f2c1834319415532d2641b086a26918ba57e63f1843040a3f5
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/award?keyword=recruitment+agency+company+profile+pdf PDF link annotation
    • https://pezuzani.weebly.com/uploads/1/3/4/6/134631528/xalafefetu_xejoja.pdfIn PDF document text
    • http://midimox.getenjoyment.net/narrative_of_the_life_of_frederick_douglass_sparknotes_chapter_7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446790/normal_6002ed4c54812.pdfIn PDF document text
    • http://kevebofuru.medianewsonline.com/exide_battery_charger_repair_parts.pdfIn PDF document text
    • http://tagoturuluro.medianewsonline.com/mowirazoz.pdfIn PDF document text
    • http://nigemutekilum.mypressonline.com/pidesusozujifiragi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386849/normal_5ffeced849d09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454822/normal_5ff279c557ffd.pdfIn PDF document text
    • http://vugekowuzujed.scienceontheweb.net/2001_honda_civic_transmission_rebuild_cost.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369646/normal_5ffdca4acb4a6.pdfIn PDF document text
    • https://fetatoba.weebly.com/uploads/1/3/4/6/134689412/1425211.pdfIn PDF document text
    • https://xibemorebag.weebly.com/uploads/1/3/4/3/134355918/wekamikedotaxep.pdfIn PDF document text
    • https://vopupina.weebly.com/uploads/1/3/1/0/131070761/8415690a3a3a.pdfIn PDF document text
    • http://beviluxenumiliv.mywebcommunity.org/jasedotanidikufeguxizib.pdfIn PDF document text
    • https://voduzivet.weebly.com/uploads/1/3/1/6/131607522/malaza-lodunuvapesirov-xibineg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495843/normal_60307294b0275.pdfIn PDF document text
    • http://nurokojo.mypressonline.com/clasificacion_de_los_titulos_de_credito_en_guatemala.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://436240a4-ef10-404e-ad90-c5cab949c7af.filesusr.com/ugd/3fb742_4447a30adc924955b756e551412e7b2c.pdf?index=trueIn PDF document text
    • https://fea67d75-dd3b-4bdd-af05-748e92ec8a52.filesusr.com/ugd/05900a_62de2745575b4e1299a6823e59393fc5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bepukuba/pusidojovasurutupufo.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/vepavokanavujovaxuwif.pdfIn PDF document text
    • http://jozobudesurarab.onlinewebshop.net/xobolavizil.pdfIn PDF document text
    • https://b84c3727-5d5a-4c5d-9d5d-21cac87b3a69.filesusr.com/ugd/fdd6c2_012a58d0abab4f67983115cfa8e1714e.pdf?index=trueIn PDF document text
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_2a9501552dce46b1a66dfda13107a8b2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/29729705853.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_off0000f644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF644 5288 bytes
SHA-256: 70ca06145ff573fe054b11cd9a34e3afbddd04d8146bb14927dd21baeda65eee
font_01_sfnt_off00010832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10832 10412 bytes
SHA-256: cdd60736240010ab7c6830a3f0cf172684a64c60796c831d2fd8f64f1245820d
font_02_sfnt_off00012bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCB 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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