Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c793b6a6dbeea4b…

MALICIOUS

PDF

81.7 KB Created: 2021-05-12 00:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3e2584be8331df58e47e60de98969ca0 SHA-1: 30d1dd8a22c4dad606ba94f9a963bd243386adbc SHA-256: 3c793b6a6dbeea4b3ed3264c2736b0f431b585a0211a6cfdd31eca41dd6059d8
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The primary URL, 'https://soxebez.ru/strik?utm_term=the+paper+menagerie+by+ken+liu+summary', is likely part of this scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://soxebez.ru/strik?utm_term=the+paper+menagerie+by+ken+liu+summary PDF link annotation
    • http://razepatonubil.22web.org/wutogak.pdfIn PDF document text
    • https://komimarokobak.weebly.com/uploads/1/3/4/6/134604519/4516572.pdfIn PDF document text
    • https://kumazazunanij.weebly.com/uploads/1/3/4/6/134622964/9203630.pdfIn PDF document text
    • https://fubexomufepa.weebly.com/uploads/1/3/4/8/134850999/vimusilimorudi-ruborotabudi.pdfIn PDF document text
    • https://jipotawa.weebly.com/uploads/1/3/6/0/136097183/87fcf9fb33d549.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://seterawexasubo.epizy.com/remove_watermark_foxit_editor.pdfIn PDF document text
    • http://xorifexudizig.rf.gd/70192302876.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1917105-3f98-49d2-b36e-cc6eeda60986/45909355135.pdfIn PDF document text
    • https://s3.amazonaws.com/roware/94477224837.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0556b0b8-6b50-4202-ae42-a635fbb35365/27471022770.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54a46ee8-88c8-4628-9a39-bab2b4b034d2/81687065880.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/38228763108.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dad913f8-b111-4305-b08f-294394ae2a36/wukaxeras.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5369833-8d06-4937-ada5-d92f77c249f5/the_right_triangle_trigonometric_ratios_worksheet_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/examining_number_sets_word_answer_key.pdfIn PDF document text
    • http://xofiketur.rf.gd/lagu_avenged_sevenfold_afterlife_acoustic.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/zesafexudoguwogomomexezul.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromisixinolib/egyptian_cotton_sheets_lawsuit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77952691-130f-4ecb-96bb-d06740bb7900/roland_spd_sx_vs_spd_sx_special_edition.pdfIn PDF document text
    • http://menepanago.rf.gd/football_manager_2016_wonderkids_for_lower_leagues.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67ca16f7-3d13-4fd4-aca2-e8a4a4b7adfc/100_sat_words.pdfIn PDF document text
    • https://s3.amazonaws.com/vefagotoje/star_map_northern_hemisphere_december_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/human_alimentary_canal_diagram.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DE 5180 bytes
SHA-256: 0568b071fecacfefa41ca31cc8037e709346baaad9c60eecf85d8a74bc3af65e
font_01_sfnt_off0001024d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024D 12644 bytes
SHA-256: 33a4de8453334204da4b1b38d97656b79598032533350a3eb58ef935bde94699
font_02_sfnt_off00012995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12995 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378