Malicious PDF — malware analysis report

Static analysis result for SHA-256 8876072f83684060…

MALICIOUS

PDF

69.4 KB Created: 2021-06-08 23:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0f6a1832146485dbbbb5472445df7d3b SHA-1: 47ef4c3d52e892111398af15d1378e54c0cab197 SHA-256: 8876072f83684060439ed3a2cf12bac8ca9ad5aca802abd99286533925596ad4
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially malicious sites. The presence of embedded URLs and the overall structure strongly indicate an attempt to lure users to external content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crysiq.ru/pbw?utm_term=big+nate+blasts+off+online+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4490547/normal_5ff1cedd28105.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486971/normal_60418fff726d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497395/normal_6065eaed1c955.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496170/normal_60646ed1a4ab5.pdfIn PDF document text
    • https://jatekokem.weebly.com/uploads/1/3/2/8/132814322/7678688.pdfIn PDF document text
    • https://vufofameti.weebly.com/uploads/1/3/0/8/130874118/bovidamudexuda_zidifujajux_fowovepaxevu_rodabafudoxo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://juwelite.pbworks.com/f/how_to_connect_my_samsung_sound_bar_to_roku_tv.pdfIn PDF document text
    • http://tereburokofe.pbworks.com/f/redufobuzezerubadip.pdfIn PDF document text
    • http://xigivesupi.pbworks.com/w/file/fetch/144839283/fundamentals_of_human_anatomy_and_physiology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1fd34bb-0c5c-42fa-8ff4-3e1adf68ae1a/vabafupunotegoben.pdfIn PDF document text
    • http://ronuzexem.pbworks.com/w/file/fetch/144772218/papas_pizzeria_hd_free_download_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9480dc2-59d7-4118-939b-42d185633ee2/xugirojidap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b060f95-b086-45c0-8db6-f2b1f04603a2/times_tables_worksheets_grade_1.pdfIn PDF document text
    • http://zevatirupura.pbworks.com/w/file/fetch/144625314/80580541253.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9a0cd00-0576-4392-b2ee-4c8f8458843b/autocad_lt_2019_mac_system_requirements.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0041598c-6bcd-4dce-9035-a9f3ee43081d/tojabuke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b46552f-f27e-4497-8498-b1912af6b37d/52928016527.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96efd01b-f6c2-4192-be1f-07bfa70ec93e/canon_speedlite_430ex_ii_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9aa98e4-ceaf-4d61-9764-dd3d2b6b7faa/modern_physics_class_12_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6a93f1d-4264-48cf-9ed5-58864e2d0d96/stihl_bg55_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ccb4bba-c7be-4c5f-89ca-96b6c4746661/what_is_the_importance_of_learner_centered_psychological_principles.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_off0000d2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F4 5304 bytes
SHA-256: eaff23d98b07bda8b32788a3ab38f091006d014c320850820350c397268a2876
font_01_sfnt_off0000e515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE515 10332 bytes
SHA-256: 6f1c84a9de6f01d1565ae4dd135527d713a2ce73be3b6aba3e1200db59904c95