Malicious PDF — malware analysis report

Static analysis result for SHA-256 cddeb2537eb116c0…

MALICIOUS

PDF

67.8 KB Created: 2021-02-21 05:00:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 807a80f1070edd045b086aff7158da14 SHA-1: a12794013f4bfbf2a0d62056db7b39bc2bf8bfb0 SHA-256: cddeb2537eb116c0b91be4c276fe5f76d7c71b93579ad9fefde02596cc02950d
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, appears to contain metadata related to search terms, further supporting the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://leonvi.ru/wb?keyword=physical%20science%20grade%2010%20november%202019%20paper%201%20memo PDF link annotation
    • https://cdn.sqhk.co/nutakurij/jjRNahi/general_tso_recipe_without_hoisin.pdfIn PDF document text
    • http://formulamoney.top/ultimate_omega_1280_side_effectsp8ey4.pdfIn PDF document text
    • http://graatorama.fun/kamirigajirnr9br.pdfIn PDF document text
    • https://lifexusubanipi.weebly.com/uploads/1/3/4/3/134377686/2029266.pdfIn PDF document text
    • http://usene.xyz/zuwumirowujud8elh.pdfIn PDF document text
    • https://bobujiwa.weebly.com/uploads/1/3/1/0/131070874/zolipewu.pdfIn PDF document text
    • https://cdn.sqhk.co/jutigurotow/ggiPFgc/vukefamapaxe.pdfIn PDF document text
    • http://vashastrahovka24.ru/xubifigafogiburijedagoks54zk.pdfIn PDF document text
    • http://tertov.xyz/96751210790llz3s.pdfIn PDF document text
    • http://detonic-ufficiale.website/what_should_the_picture_settings_be_on_a_vizio_tvwulcx.pdfIn PDF document text
    • https://cdn.sqhk.co/rasepotobami/Kjdij4K/block_story_seed_for_dragons.pdfIn PDF document text
    • https://xotozefubineru.weebly.com/uploads/1/3/4/5/134576546/fekelubiwax-tinulokufef.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/jhgjhcQ/talking_angela_creepy_man.pdfIn PDF document text
    • https://cdn.sqhk.co/vodadavubex/hmq2hc3/futezamodige.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://finubovuputok.epizy.com/alternative_zu_google_chrome_android.pdfIn PDF document text
    • http://misamoxatupepos.rf.gd/chess_anthem_sheet_music.pdfIn PDF document text
    • http://mafofeguf.epizy.com/cha_cha_espana_line_dance_step_sheet.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_off0000c7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E6 6272 bytes
SHA-256: 39da4830a77e6b287c07b428f686b14986447971fbecb2db5ad96e6b408d1f18
font_01_sfnt_off0000dd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1C 11160 bytes
SHA-256: 575788affb60ac914b41acbcd241325551beeece39ba4b2614cf905129b00277

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