Malicious PDF — malware analysis report

Static analysis result for SHA-256 305375ffc61d1713…

MALICIOUS

PDF

75.9 KB Created: 2021-04-03 12:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 026829fffc7dbfe7632e1be980ff1d93 SHA-1: f5dbabb8fb340306dbb0d627cf412b754256d104 SHA-256: 305375ffc61d1713ea37f9a486add3711cf3185b090306f4a359ca0df36fd068
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with several pointing to known malicious redirectors or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The heuristics suggest the PDF is designed as a link farm, attempting to lure users to various external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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://dafemum.ru/award?keyword=risk+management+process+iso+31000+pdf In PDF document text
    • http://xujosigij.iblogger.org/taworarasavuzazobix.pdfIn PDF document text
    • https://cdn.sqhk.co/letinumi/9jbGjbb/18693038626.pdfIn PDF document text
    • https://zatibuvox.weebly.com/uploads/1/3/0/7/130738619/268bad05f15ec5b.pdfIn PDF document text
    • http://datekal.22web.org/vugozunogilaf.pdfIn PDF document text
    • https://sazukigozozabep.weebly.com/uploads/1/3/4/3/134310948/7f81c2620c.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/heTgjhf/ninja_arashi_game_hack_download.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/2fjdugc/candomble_religion.pdfIn PDF document text
    • https://cdn.sqhk.co/zegodoxelob/eohcgd6/nonfiction_text_features_worksheet_4th_grade.pdfIn PDF document text
    • http://mevatupumave.22web.org/american_government_and_politics_today_brief_edition_free.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/ihjb3SM/zudojijal.pdfIn PDF document text
    • https://talegojozafadi.weebly.com/uploads/1/3/2/3/132303005/misewaluwawif-bomekaxere-peromutatenuli-zuzotezexu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/modern_romance_aziz_ansari_download_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6bdbf4c-03d9-4a63-8b84-4d6c251eb0d1/dlink_dir-655_wifi_setup.pdfIn PDF document text
    • http://jazosorolanik.rf.gd/50525359130.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/pexerexeloledafifasujepa.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/62727840932.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5fa91fa-5408-43d1-8f03-737714021c10/quadratic_equation_exercise_4.2_class_10.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/the_shining_cast_then_and_now.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6353fb36-a772-4cd9-af17-dc1443f86642/pwm_solar_charge_controller_design.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_off0000e8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D1 5872 bytes
SHA-256: 88d060150c1de55500c9b943182a4816b3670b63927184715ad91812e99a9b19
font_01_sfnt_off0000fcc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC8 11028 bytes
SHA-256: 492692e3cebc493aa54c4679482e378aad27bd395ef7b178b0e2598b4d2bcdaf

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