Malicious PDF — malware analysis report

Static analysis result for SHA-256 71dcc7de2fdc62c7…

MALICIOUS

PDF

92.7 KB Created: 2021-03-11 14:52:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: f240cdc674140a1e5cdb48f00b8fb5ad SHA-1: 509f26205b4c76072215f8f2c54a372ef1072d4a SHA-256: 71dcc7de2fdc62c7d8a558012ab8d80c36ab1194351200fa06e349ade0588f04
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms and phishing lures. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URLs, such as 'https://nipisod.ru/award?keyword=baja+autoestima+causas+pdf', are likely used to redirect victims to malicious sites. The presence of external links suggests an attempt to lead users away from the document to a potentially harmful destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/award?keyword=baja+autoestima+causas+pdf PDF link annotation
    • https://makezuxakoje.weebly.com/uploads/1/3/0/7/130739015/bazelumu.pdfIn PDF document text
    • https://jobajepefo.weebly.com/uploads/1/3/1/4/131482915/fa5cb74.pdfIn PDF document text
    • https://pejupatuwotim.weebly.com/uploads/1/3/2/8/132814375/fa7f2235cf7cf7.pdfIn PDF document text
    • http://lulopoboxefon.scienceontheweb.net/what_is_a_blue_jacket_in_the_navy.pdfIn PDF document text
    • https://gapefupekud.weebly.com/uploads/1/3/1/8/131871489/zuvokalisisasig.pdfIn PDF document text
    • http://vulufinagi.mypressonline.com/rubizajef.pdfIn PDF document text
    • https://radigaligoled.weebly.com/uploads/1/3/4/3/134333621/ravazetirenow_xusojeparogabil_wifofimosagin_residef.pdfIn PDF document text
    • https://vigodabazo.weebly.com/uploads/1/3/4/8/134872933/8b120326.pdfIn PDF document text
    • http://nituzovido.getenjoyment.net/gejuwudamefobe.pdfIn PDF document text
    • https://totamozosapopa.weebly.com/uploads/1/3/4/7/134712517/nogufifurekararaf.pdfIn PDF document text
    • https://cdn.sqhk.co/fowijuseziju/haX3eid/file_manager_pro_apk_revdl.pdfIn PDF document text
    • https://cdn.sqhk.co/nufesewepi/iGRjcgR/best_arcade_shooter_games_android.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/1c3d9ddb-ba60-492e-8d9a-757ae2b02f76/how_to_make_crown_royal_peach.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6f57b9a-2f21-4941-875e-815c6fd4ee7d/ask_and_it_is_given_free_download_full.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f844eb73-837c-440c-a108-8c5a16f7d34a/starcraft_2_average_ranks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfe84592-5842-4407-be7f-cccc0890a7c0/52421402789.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce32b779-ced4-41f7-9e44-1c0f0338e6e2/logic_truth_table_exercises_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9d74f73-a313-479a-b08e-d41cbd657655/28300570867.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_off00012202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12202 5300 bytes
SHA-256: d71d741aa1e5637d268ca50722301361cda2c633e820233805ce256f59b27f5e
font_01_sfnt_off00013405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13405 16092 bytes
SHA-256: 60d2ec7d01a4e5dd76594f39c93171e652396f1c075e849752035992acd40d8f