Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8703aaef5194ad9…

MALICIOUS

PDF

69.5 KB Created: 2021-02-18 18:07:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 780b231151e407b6604a2a10ab6cecea SHA-1: 9ccc5eeee8157ffc584a91b5a83dee895c8b1026 SHA-256: c8703aaef5194ad94f4e5c449dbf91809706e0f96a626f5ae535e87e970e3fd7
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or link-farming operation. The PDF's structure and embedded links are consistent with techniques used to redirect users to malicious websites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://druttle.ru/strik?utm_term=focusrite+scarlett+price+in+nepal PDF link annotation
    • http://teksalle.xyz/vegan_recipes_breakfast_easyqxrsa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383577/normal_5fc9b436186ba.pdfIn PDF document text
    • http://logoped-samara.ru/jaremomesoviqpsh1.pdfIn PDF document text
    • https://waretopaze.weebly.com/uploads/1/3/4/5/134529701/7896961.pdfIn PDF document text
    • http://checkmyscore.info/lockout_relay_86_protectionppfz9.pdfIn PDF document text
    • http://comforfemj.fun/lamujucy85r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470400/normal_6022ca587991a.pdfIn PDF document text
    • http://idealica-italiauficiale.website/cardfight_vanguard_arg_decklistfeb49.pdfIn PDF document text
    • http://usesalle.xyz/asiga_pico_2_manualq3qbz.pdfIn PDF document text
    • http://verifybadgehelp.com/block_letter_fonts_dafontxcxag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376087/normal_5fc5980bb09b1.pdfIn PDF document text
    • http://instapriz24.online/75665828909cj4xt.pdfIn PDF document text
    • http://hugertely.xyz/download_offline_fm_radio_tuner_for_android1a96b.pdfIn PDF document text
    • http://adv-workshop.site/kitanomaru_park_japan_guidef12b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471256/normal_600c764b1f9bf.pdfIn PDF document text
    • https://dekomowunine.weebly.com/uploads/1/3/4/6/134638227/610cfeb5f64847.pdfIn PDF document text
    • http://grizhoff.ru/loxomomikufodigisivedsw7s.pdfIn PDF document text
    • http://policyhelpcenter.com/getefadowefq20u9.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/pulavokaxe/45803707841.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/maradona_by_ykee_benda_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/annual_report_examples_2018.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_off0000d380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD380 4884 bytes
SHA-256: 3961fe4f5ab95cb15ef59337a773391e6f9d4a35f522430f3a822d13377e92b0
font_01_sfnt_off0000e42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42C 10580 bytes
SHA-256: 3cacde5c2c6bd5463b7409b05cc81e558797dc3d9f576cf0591cc75807462e2a

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