Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac0b25d61f29184e…

MALICIOUS

PDF

74.2 KB Created: 2021-04-29 22:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 633896e76c8e8b8ca19b45e963217f02 SHA-1: d220ef331b51d40068c14dfbb49bd78bb2be046a SHA-256: ac0b25d61f29184ec3ec0cba163f095a53c6094523656fb8bb41bf50622b9305
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users to potentially harmful sites. The ML classifier and ClamAV detection strongly indicate malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • 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://dugedepap.ru/strik?utm_term=formulas+volumen+de+prismas PDF link annotation
    • http://lesagotefawa.22web.org/balancing_equations_worksheet_bbc_bitesize.pdfIn PDF document text
    • http://bilapak.66ghz.com/98738381978.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495055/normal_602b85456bddc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497359/normal_5fcabef907bb1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bivezekamolekaz.rf.gd/amadou_hampate_ba_gratuit.pdfIn PDF document text
    • http://kipawewori.epizy.com/wuvonupulokoluta.pdfIn PDF document text
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_65cbd7bed349497fb27cbd14ce63e39d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/mandino_greatest_salesman_in_the_world.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/type_umlaut_android.pdfIn PDF document text
    • http://tuxizosog.rf.gd/vexogobade.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/fios_quantum_gateway_router_g1100_red_globe.pdfIn PDF document text
    • https://cc67bef4-e22e-42fd-bf01-3f02b15f800b.filesusr.com/ugd/080020_f2223ff4d5a34b8799bfd6ba45a9a2db.pdf?index=trueIn PDF document text
    • http://ratezomi.epizy.com/texelinax.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/bhai_movie_song_video_hd.pdfIn PDF document text
    • https://1ba6f066-89d4-4445-b8a9-08a6de046ef2.filesusr.com/ugd/d40554_df35c331be66469983b77bfb090d969b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/budget_worksheet_printable_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/bts_epiphany_viola_sheet_music.pdfIn PDF document text
    • http://dumizalu.epizy.com/bodybuilding_training_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/exam_questions_and_answers_in_biostatistics.pdfIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_b2ccb552b66b43d19b44c02402e55f1c.pdf?index=trueIn PDF document text
    • http://rodujuvutadaxam.epizy.com/picsart_premium_mod_apk_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/tosego/34415858288.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_off0000d814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD814 3064 bytes
SHA-256: 750b8ae9e0ccb56efd42408d9f0b2fad6e8aa4275edb6569918a4ed6f5e8248b
font_01_sfnt_off0000e2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FE 5120 bytes
SHA-256: 14ac53ae6160e1526ca98a5b92c8985bfe5a1a466f3fb1bb4bd258d3a2914bed
font_02_sfnt_off0000f456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF456 11244 bytes
SHA-256: 477cd32bd4510b52896a6bc9da55558966e86503e7ccbe6408b1e3c73ded94cc

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