Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e1647a6c81bc4e5…

MALICIOUS

PDF

75.3 KB Created: 2021-03-15 07:04:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: fa54cffb2e61049a37e904c35a213b46 SHA-1: bff1fdfa3f45b09b5868a8b615be70b6518ae72b SHA-256: 8e1647a6c81bc4e595c2c468a8ace3f14a1d4917471bffd2d8037f9cc8e2e281
126 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 high likelihood of malicious intent. Numerous embedded URLs, many pointing to disposable domains and using UTM parameters, suggest a phishing or link-farming scheme. The document body, though heavily obfuscated, contains text related to a Netflix show, likely a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://jottigo.ru/strik?utm_term=shows+like+defending+jacob+on+netflix PDF link annotation
    • http://nakonuvexurilov.iblogger.org/baby_bjorn_bassinet_review.pdfIn PDF document text
    • http://nikibolerobika.getenjoyment.net/bowling_green_state_university_campus_map.pdfIn PDF document text
    • http://kyukty68.xyz/94362536932x2ac0.pdfIn PDF document text
    • http://tupaxeguna.scienceontheweb.net/48968667269.pdfIn PDF document text
    • http://allrecipes.pro/lalofitozisatu479zu.pdfIn PDF document text
    • http://musemumazizer.22web.org/how_to_connect_rca_sound_bar_to_tv.pdfIn PDF document text
    • http://laserisesiseno.getenjoyment.net/rozunaxakumeku.pdfIn PDF document text
    • http://goromeo.club/3731992323741r2f.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/85eb2354-e840-44d2-a5ab-ddb4a396eb1d/42098255686.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/rirovagavimosizi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fa36f41-4bad-4432-a7ac-319836736565/sojurejubuja.pdfIn PDF document text
    • http://vuxonisozezuxov.rf.gd/certificate_of_incumbency_form.pdfIn PDF document text
    • http://beritoka.rf.gd/womomezum.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/whatsapp_emotional_song_video.pdfIn PDF document text
    • http://mikijanux.atwebpages.com/kuviruvesofapiwikos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9401d408-100a-4a8e-b96b-707f8df5f0de/sekekomexepuli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45efd104-9444-45d5-9cbe-736c8fdb9c67/2006_bmw_x3_service_engine_soon_light_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd8835e0-67f1-4be3-bc7c-297df2e3365b/oracle_19c_vversion.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/zasazapasuninageluvetoguf.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/figured_bass_sheet_music.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_off0000e65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65C 5728 bytes
SHA-256: 17bc3fdf087118c99194811b854845859f0c7bf6b0d57dcf09ba2596263f7f41
font_01_sfnt_off0000f9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F5 11136 bytes
SHA-256: 68e45915cf64a160ddf64306c385e1b384155bc1fd1a5356a87599e5973eeecd

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