Malicious PDF — malware analysis report

Static analysis result for SHA-256 7085d1671d92183d…

MALICIOUS

PDF

82.5 KB Created: 2021-06-01 13:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 52496ec8a4cbbfc6e3d91634b4a34460 SHA-1: b1ed4e08be7f065bd53303380ca6651a41450a83 SHA-256: 7085d1671d92183d90b469cefef18a855d7c4423270994514a25551bc127788b
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crewmak.ru/pbw?utm_term=adeste+fideles+testo+latino+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367007/normal_6010f2a0c721a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407306/normal_5fda7b1849090.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497666/normal_60533c61142cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368497/normal_602adef08a8f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376619/normal_5fcd2f4eedd17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391903/normal_601a2ec9791d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404514/normal_5fdaf199b7b18.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460954/normal_5fcf09b2e903f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449766/normal_6016c5c50b761.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401515/normal_601867f357f79.pdfIn PDF document text
    • https://gijufonuvaxi.weebly.com/uploads/1/3/4/8/134874477/gofumunetirafeb-febuzi-zuzojenofuba.pdfIn PDF document text
    • https://vimijalubatek.weebly.com/uploads/1/3/4/7/134739875/4472666.pdfIn PDF document text
    • https://pigudoxuwupif.weebly.com/uploads/1/3/1/4/131437670/zimajiwupero-vobazufoditodot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416660/normal_604fb0e4413f2.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/39202ff8-31cc-4b4f-ace1-967246bf1432/revenge_of_the_dreamers_3_deluxe_zip_file_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57b45b04-a73e-40db-b476-c334ba6b4dcf/uncle_toms_children.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6febae5e-46f4-4b67-96ac-7115e490f301/digobonolivududizoxuxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df1fab07-1304-4b99-adbd-1ba4e103b6e3/brother_reset_drum_end_soon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97d4238a-e732-46bc-8039-1757f3c86cbd/britax_marathon_car_seat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47e23f7a-364d-4d14-b1f2-c525d156480f/robot_coupe_r2_operating_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec58535f-5d8a-4ea4-86e8-12185e334a26/ap_biology_properties_of_water_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/500b5644-80f4-47e4-9bf7-ea609741ed7d/84241894556.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e2e6dc1-1595-4ed7-aaff-176205f4d625/28645646794.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d5cf4ca-73a4-4e22-999b-0583f155e6bd/puvogunakerixamogulog.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_off000101a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A8 4928 bytes
SHA-256: 3321152c2f1b77e5d701bc7c5527fd551fe9fdf00c9f905db7a697cfa1b07bcd
font_01_sfnt_off00011287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11287 12920 bytes
SHA-256: 6f476b379a2190e0c5bbbb77be3a13e063e667f45c673a7dd0058537fc5e0880