Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7c9b3f8b561b1d…

MALICIOUS

PDF

71.7 KB Created: 2021-01-02 13:29:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7dbe4c7550426db3a686c6880adaad1d SHA-1: df9df1c22f558951f9ff450d3cfb6e5ed7c9e9b2 SHA-256: ef7c9b3f8b561b1d8f85f818e8ec3015eb5a7866bb5248db3fd75847c2b343f9
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to 'Ace online test series gate 2018 pdf'. The presence of multiple external PDF links indicates an attempt to distribute further malicious content or redirect users to phishing 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/aws?utm_term=ace+online+test+series+gate+2018+pdf In PDF document text
    • https://jotitotibewava.weebly.com/uploads/1/3/1/3/131383271/2d32f3ce578.pdfIn PDF document text
    • https://nutomejeti.weebly.com/uploads/1/3/4/7/134702699/fd3ab52732.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/64e7c82a-393a-4af9-aa77-7487a46eec61/fokejiwoxun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb4ac404-623f-4e29-a546-539b372bbd86/68390320169.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/825921cb-643a-4dc3-9469-19962ae50f78/tozutilunivinozevinudu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5308fd8b-a9c7-4ddb-9e7d-7531849583a4/joana_fallout_new_vegas.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/rodanuwemo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afc0619f-bb79-4320-a1b9-f78de47a8304/kitchenaid_whisper_quiet_ultima_dishwasher_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe94ac5d-a46f-4077-bb0a-909184b4fd44/stray_cat_blues_chords_and_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8c44171-5313-48b9-bdc9-80e877d3f159/woxir.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/sudutagowijopeximut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fedf7549-d939-4cbd-8e52-e24e98bd2239/fizanabozux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb2010e4-6bc0-4820-ae93-e1be4efdc3ea/38028224162.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aecdd1df-bd91-4cf6-9010-0cf83219cde7/lainitas_mexico_ejercicios_complemen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5cbddd0-cd85-4045-849f-c353496e871a/teta_job_board.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_off0000d602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD602 5832 bytes
SHA-256: ef181c08718eb0795fdc1e4020b21a5f9a62d7c51945ae495b08930decad8c02
font_01_sfnt_off0000e9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F2 11748 bytes
SHA-256: dc32e329cd7326f8ea3906b92e1ea2c5d7ea7d3d7f0e78abd4dfd688aaacc6b0

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