Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ccaddd0cad9cf64…

MALICIOUS

PDF

79.0 KB Created: 2021-06-09 19:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a6bf3d8ead5188bea93aefb2f07c72c5 SHA-1: 3e52583230a6e912f62bf5c1350697801c9120a0 SHA-256: 7ccaddd0cad9cf642316de6d4fb08554c161de03682781996aaf0ff3b656d95e
194 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous external links, many of which are hosted on disposable domains, to potentially trick users into downloading further malicious content. The presence of external URIs and a link farm structure strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/pbw?utm_term=left+4+dead+apk PDF link annotation
    • https://donedupefunesu.weebly.com/uploads/1/3/1/6/131607777/d8a036925e605.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451353/normal_605a263193839.pdfIn PDF document text
    • https://nobaditidiz.weebly.com/uploads/1/3/4/2/134235496/sumisam_xuzixovo_puxoludotepeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372383/normal_5fdf2cd74d8c0.pdfIn PDF document text
    • https://mosatidopo.weebly.com/uploads/1/3/4/7/134731439/2714101.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419412/normal_60415c12a44b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421038/normal_602b34b75df71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500904/normal_602ca4605d066.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393044/normal_603ddfb173ca9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465403/normal_60b856a018014.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380068/normal_603e380517598.pdfIn PDF document text
    • https://gojaxuwawozupu.weebly.com/uploads/1/3/1/0/131070912/suruje.pdfIn PDF document text
    • https://fokifukamanur.weebly.com/uploads/1/3/0/8/130874497/2111254.pdfIn PDF document text
    • https://vavawuzozut.weebly.com/uploads/1/3/1/1/131163550/wusulere_dunuj_mopixoj_sevekowipofok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488323/normal_605f30dc21a01.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://niraxaba.pbworks.com/w/file/fetch/144892176/40546590198.pdfIn PDF document text
    • http://vimadutukad.pbworks.com/w/file/fetch/144439422/39206290506.pdfIn PDF document text
    • http://xoxafepapesu.pbworks.com/f/62713734955.pdfIn PDF document text
    • http://jevibufile.pbworks.com/f/tabla_de_pesos_volumetricos_de_materiales_de_construccion_reglamento.pdfIn PDF document text
    • http://fifekapem.pbworks.com/f/what_are_the_main_elements_of_accounting_equation.pdfIn PDF document text
    • http://dejapitud.pbworks.com/w/file/fetch/144879564/fur_elise_notes_abc.pdfIn PDF document text
    • http://xawaren.pbworks.com/w/file/fetch/144418629/baofeng_uv-5r_legal_in_india.pdfIn PDF document text
    • http://xugilip.pbworks.com/w/file/fetch/144627924/manual_accounting_system_vs_automated_system.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE570 4824 bytes
SHA-256: c28e7347f2cb9be73811f475cd2dc870922a5a6da1ddfc4eb78a3bac7b1c12ce
font_01_sfnt_off0000f5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FD 10092 bytes
SHA-256: ac21691a129141a08a3ffbf75908b1a793a6f638e6a46c753f834ad3471d86a2
font_02_sfnt_off00011873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11873 16064 bytes
SHA-256: 1398bbf2dfd9cae4409d1d8ab67a79f495e147aa07cce54436be1c2862721d78