Malicious PDF — malware analysis report

Static analysis result for SHA-256 815a30f02c739915…

MALICIOUS

PDF

129.2 KB Created: 2021-01-13 22:53:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7acb426ea4b7a974697dd25ddea79baf SHA-1: fbe5064bddf6ec7574a9e3cc98334e45d6dd5e79 SHA-256: 815a30f02c739915da130674abf4092335b68f77020e3adc91dd4a675dc76e96
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, and also detected by ClamAV. It contains a large number of embedded links, including one pointing to known malicious redirector infrastructure. The document body is heavily obfuscated, but the presence of numerous links suggests a link farm designed to distribute malicious content or phish users. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/wb?keyword=dragon%20ball%20arcade%20games In PDF document text
    • https://zixojubagever.weebly.com/uploads/1/3/4/6/134613499/wugubapijina.pdfIn PDF document text
    • https://cdn.sqhk.co/xubuguxovim/IghiaZv/razobi.pdfIn PDF document text
    • https://site-1171771.mozfiles.com/files/1171771/fun_facts_you_may_not_know.pdfIn PDF document text
    • https://cdn.sqhk.co/nusideja/hfijgeu/chuchel_free_download_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/genamudazunu/5jdsVN3/battle_royale_call_of_duty_modern_warfare_ps4.pdfIn PDF document text
    • https://cdn.sqhk.co/potiribuwuf/jtXvig4/63515353774.pdfIn PDF document text
    • https://cdn.sqhk.co/kufedefivuvu/51gcLic/busuzuranib.pdfIn PDF document text
    • https://cdn.sqhk.co/mavixuwaloz/Egehh1U/are_there_free_movies_on_apple_tv_app.pdfIn PDF document text
    • https://cdn.sqhk.co/xufatirumina/hiANcha/mowozopenon.pdfIn PDF document text
    • https://cdn.sqhk.co/pawosuku/dhasJge/hello_neighbor_hide_and_seek_android_apk_obb.pdfIn PDF document text
    • https://kajumosezu.weebly.com/uploads/1/3/4/7/134749214/bba22b3c23d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449406/normal_5fa617810defc.pdfIn PDF document text
    • https://site-1167950.mozfiles.com/files/1167950/fallout_new_vegas_terminal_hack_cheat.pdfIn PDF document text
    • https://site-1175108.mozfiles.com/files/1175108/lutononobapilutuwalenepas.pdfIn PDF document text
    • https://cdn.sqhk.co/paparidew/eihhjhc/best_3-_point_shooting_centers_2020.pdfIn PDF document text
    • https://site-1180237.mozfiles.com/files/1180237/22901555218.pdfIn PDF document text
    • https://site-1179350.mozfiles.com/files/1179350/54500270335.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001816f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1816F 9532 bytes
SHA-256: aa65f49d7536560653bf49b811804c41137955040c3bb69d2b9b2ff3313fc93a
font_01_sfnt_off0001a0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0EC 5396 bytes
SHA-256: d0995df770c68fc68b599d72e049dce0fc76f457055cfe65978e8b630780e495
font_02_sfnt_off0001b32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B32E 15120 bytes
SHA-256: 97278d16acc4fe482df74b164cc93be33231971415eebff0b572f68d7f3f0cc7
font_03_sfnt_off0001e14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E14C 16280 bytes
SHA-256: 17df8a6a041eb91817c41511c30c0b43be8c33f679682f8c3eda07aef0b75e02