Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83d4eb8822d0b4b…

MALICIOUS

PDF

86.1 KB Created: 2021-03-15 14:59:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 74198ac591b804373e7691e0e15980a9 SHA-1: f1d1e34cb6597ac0baad9a13b4c5aaf23d7012bd SHA-256: c83d4eb8822d0b4b4a1824a92b363246c49953afdfab501acd44c7ba5154cbeb
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external links, with one pointing to 'bologen.ru', suggesting a link farm or phishing lure. The document body, though heavily garbled, contains keywords related to study guides, reinforcing the lure. No scripts were extracted, but the presence of external links and the malware detection strongly suggest the document is intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/wix?keyword=government+study+guide+answers+for+the+outsiders PDF link annotation
    • http://kedepoba.sportsontheweb.net/the_future_of_life_quotes.pdfIn PDF document text
    • http://fasoxuxesatilu.sportsontheweb.net/93012247366.pdfIn PDF document text
    • http://gadivawiw.sportsontheweb.net/xumuzira.pdfIn PDF document text
    • http://pirewarekow.mywebcommunity.org/xomokefexezoreta.pdfIn PDF document text
    • http://safijejog.mygamesonline.org/axial_yeti_jr_can_am_battery.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://s3.amazonaws.com/gozilum/job_description_for_sales_representative_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/french_to_english_translation_dictionary_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/badgercare_enrollment_form.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/carson-dellosa_cd-4301.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/que_es_un_manual_de_calidad_segun_la_norma_iso_9001.pdfIn PDF document text
    • http://mikijanux.atwebpages.com/celebrate_recovery_step_study_book_2.pdfIn PDF document text
    • https://104e0e48-a4c2-4a03-8647-06ef64d4e6ac.filesusr.com/ugd/e2c6c1_2add6c5c186c4b619e2ef4d42a9307df.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e75b844-3533-42b3-b186-4988fc9bb982/connect_laserjet_cp1525nw_to_wireless_network.pdfIn PDF document text
    • https://7ae52be2-ba3c-41fb-8935-29281088223e.filesusr.com/ugd/affaa6_128d398d95ad4c3b9ff5bf6e73bcca32.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wetevali/28046535597.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/007d8bb8-b1ed-451b-846c-c238e2c979e2/lipix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e4f3f6d-d8c6-47cd-aebb-f98282f13131/10526661711.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_off000102ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EF 5456 bytes
SHA-256: be63e7768a15ab058d8d4633f3117e94dee8c4ba07550b9d04f92feb4d54ecc6
font_01_sfnt_off0001156c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156C 11668 bytes
SHA-256: 4d835ff45ed475a9dc92c90336bbe0c71c8d4bd2d3c6b1a8dc7512a822959ff9
font_02_sfnt_off00013ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CEB 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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