Malicious PDF — malware analysis report

Static analysis result for SHA-256 a65df216dfea3f33…

MALICIOUS

PDF

73.3 KB Created: 2021-03-28 00:28:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5be9b24e78cf813aee623d2f0d931da9 SHA-1: bed77db79cff38bd4ed5c20c72c886e8a5406c56 SHA-256: a65df216dfea3f337b0efc8c774203d027b6d03e641931f63f314e80c6a87403
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to potentially malicious or SEO-farmed sites, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to malicious content.

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 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://druttle.ru/123?utm_term=altronix+al600ulx+data+sheet PDF link annotation
    • https://cdn.sqhk.co/fetedudi/lRG7Pgg/68747700413.pdfIn PDF document text
    • https://cdn.sqhk.co/wojipezusax/hejHx8I/12703255796.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/c62676c3-3dcb-4517-9564-e9ad5c3e096c/jenabewotarinulijibosal.pdfIn PDF document text
    • https://6ada6c45-9e8d-4063-9633-40b9e375d9b0.filesusr.com/ugd/9a7afa_3d97bbcce9f5418e980a33be9917852f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/51ca8b4a-999a-4a9a-b004-81aaa7e64d94/fifty_shades_of_grey_full_movie_sub_indo_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b959e52-44dd-4a3b-90fe-14d8d35c72e8/32228528205.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/upsc_online_form_correction.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/cover_letter_graphic_design_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wutogugej/blue_point_car_scanner_eecr1a.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d384c207-aae9-4373-82ae-2d885de6ab9a/panasonic_6.0_plus_manual.pdfIn PDF document text
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_4e6606b633124eb083ac6fa0b9769ac3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kavalukato/fojekiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6aae5f2-0211-407d-b024-bb7125a20e33/fluval_306_impeller_replacement.pdfIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/21546844558.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/kevibopig.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezux/pilgrims_progress_movie_2019_cast.pdfIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/28112614005.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/33615903498.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa1e70d1-3931-490c-9997-3245198a89bb/kosipafejamidasukom.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/balance_sheet_accounts_reconciliation_definition.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_off0000e071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE071 5264 bytes
SHA-256: 75eebc26101494d1e795bea608f6453f618a0ec9d67127ca2035339396a9f368
font_01_sfnt_off0000f250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF250 10992 bytes
SHA-256: 1978037aa012b7bd5b3cef1419dc7d33a39dd1665e4fad6e24293b3002077cd1

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