Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7e568a651f011ad…

MALICIOUS

PDF

89.6 KB Created: 2021-06-01 17:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: f668724d41a56bb35404f8de846fd2a8 SHA-1: d5eb81df3faae5f50323bc4eb90fad79a36ac1e2 SHA-256: b7e568a651f011ad84f76d1f5f850259b1b7bb8185bb1c524cec1532dec09f2b
186 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 0.9996

Heuristics 6

  • 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.
  • 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://druttle.ru/123?utm_term=paper+moon+affair+movie+free PDF link annotation
    • https://sozufozixukuba.weebly.com/uploads/1/3/4/7/134730132/bfae73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450434/normal_5fcc2d0edad02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369912/normal_601e3ff26c3af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454822/normal_5fdff2ea75f1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447085/normal_6035af500c46e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383804/normal_60515bba63680.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4450415/normal_60b3a1ceedaa6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469126/normal_6044672137738.pdfIn PDF document text
    • https://dabawide.weebly.com/uploads/1/3/7/5/137511183/borujer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417207/normal_60180d72906b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427799/normal_603466ef3f52d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410207/normal_6045e4f33ea80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367633/normal_6046107b47567.pdfIn PDF document text
    • https://lugifepitel.weebly.com/uploads/1/3/2/7/132710690/fulimaxurokuzi.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/e15ca0e4-f53f-4205-823a-308030c0d53a/how_to_print_avery_address_labels_from_excel.pdfIn PDF document text
    • http://gatasulupu.pbworks.com/f/60775476912.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df468328-61cc-4f2b-bd0a-625da61bd701/cual_es_la_funcion_del_sistema_nervioso_y_endocrino.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22e03ff4-ab87-4823-8090-fe5b1011418a/jabodexomuwefo.pdfIn PDF document text
    • http://pezeliv.pbworks.com/w/file/fetch/144423807/25493864332.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38def0f6-af9f-4e7c-b3a4-d0ae804eb2fa/5799138114.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013b44.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13B44 18600 bytes
SHA-256: 777a5b3d789ccc528e2e8cfe739e38c18d3e8147620cb828509931443ba6963a
font_00_sfnt_off0000f3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CE 4196 bytes
SHA-256: 3bafdb33d860f828a48a70fb3e373df896af7c6cd9ebd3e5b29135ceea7f4aee
font_01_sfnt_off000102b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B3 4900 bytes
SHA-256: 38f734dc66fb6727a9dd46e5fb267667342b143d82259eb9d4e7a10ec542107d
font_02_sfnt_off00011351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11351 11716 bytes
SHA-256: cc9df56d6964ddf6de3c35217f22a20b3d09cea6994874c97d27050f63089bb9