Malicious PDF — malware analysis report

Static analysis result for SHA-256 953f9722a7f68522…

MALICIOUS

PDF

72.2 KB Created: 2021-06-14 04:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ab544b29743b24df895052fad5b7db73 SHA-1: 1f9a38270e4ff70642c7e06363469a538a187a4c SHA-256: 953f9722a7f68522b1fb188187b59d85b2849cbc32daf4d343efd33a81ac0c28
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://drafthe.ru/pbw?utm_term=usha+rani+tamil+novels+free+download+pdf PDF link annotation
    • https://tekeginisexufu.weebly.com/uploads/1/3/1/3/131381150/newigexivexadez_tajogivubu.pdfIn PDF document text
    • https://vogovolakufa.weebly.com/uploads/1/3/4/8/134874318/1a92c96476.pdfIn PDF document text
    • https://sorimuzumetig.weebly.com/uploads/1/3/4/5/134519591/8453719.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4422161/normal_60aff08a4aa12.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473031/normal_6001eb670adae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413120/normal_6050640d0a525.pdfIn PDF document text
    • https://domaruvujus.weebly.com/uploads/1/3/2/6/132683142/2dafc1a3.pdfIn PDF document text
    • https://kimonasisu.weebly.com/uploads/1/3/5/4/135400987/14defccf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456984/normal_606ceb69d7287.pdfIn PDF document text
    • https://vakexojukesazi.weebly.com/uploads/1/3/0/9/130969985/kigub.pdfIn PDF document text
    • https://vokejivig.weebly.com/uploads/1/3/4/3/134322053/4002841.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413236/normal_60480a7a40534.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/1aae1025-2387-4c98-b325-de735ab9a940/16715600127.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60d3ff62-7e15-4c06-a66c-e54fcb2c2fb5/street_dance_of_china_season_2_winner_captain.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31344809-6965-4cb3-a23f-afbc49e74be7/how_to_use_turtle_wax_headlight_restoration_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5ef0b67-90b6-4510-9890-c36e6f6c1e8a/dibujos_de_ventanas_para_colorear.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df210842-d771-473f-bef8-154020e6ebdd/why_is_my_washing_machine_not_using_the_detergent.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b76468e6-972e-4f23-99a4-1784aa1280f4/algebra_lineal_grossman_7ma_edicion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1b1ecef-3709-4e68-b828-d95f829ee3bd/integrate_sin_inverse_x_square.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/760e6f10-1c01-47f8-960e-d2899b63e88e/nazapudodonisasufag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/121c77aa-0192-411d-883a-cf988ed5d363/72637954880.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17e69a58-e907-4994-9993-add4f58bb198/vijoduwapajan.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_off0000d856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD856 5424 bytes
SHA-256: e4f1bde20b543ca37470cff7f6b76a4289ffc9b4680cdc15046ecf406a9a3631
font_01_sfnt_off0000eaba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABA 13284 bytes
SHA-256: b1012bd828cb6597407863be6ed98a5bbdfd2e1a95cdcf515846da018683510b