Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b7d3c6b39fc0d1c…

MALICIOUS

PDF

70.9 KB Created: 2021-02-04 23:10:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: a4f8d16ff9ec1aac3013e08b55bebbfd SHA-1: 53ddeb8e78729da8a3ce68a087ad44792b5000de SHA-256: 7b7d3c6b39fc0d1c8105096d607efc05d2962d73b58a9db86242a05938fff957
244 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://yafferge.ru/wb?keyword=confirmation%20letter%20email%20template In PDF document text
    • https://zemutixo.weebly.com/uploads/1/3/4/8/134865820/dedevavasub-merevu-jesaxifazaxod.pdfIn PDF document text
    • https://zibiwatogotoz.weebly.com/uploads/1/3/1/1/131163514/juzupun.pdfIn PDF document text
    • https://cdn.sqhk.co/fawabanof/ih9ihlk/doom_eternal_dlc_release.pdfIn PDF document text
    • https://zegepefuloruwan.weebly.com/uploads/1/3/4/0/134012378/3fd7bbdb6632.pdfIn PDF document text
    • https://cdn.sqhk.co/xonepogafix/evibkjc/baby_lullaby_relaxing_baby_sleep_music_fish.pdfIn PDF document text
    • https://cdn.sqhk.co/fufigavaki/arQkjfS/pemomukaxaponomizanekapa.pdfIn PDF document text
    • https://cdn.sqhk.co/fumamimed/gcxgdib/skylanders_trap_team_starter_pack_xbox_one_ebay.pdfIn PDF document text
    • https://xurozakewera.weebly.com/uploads/1/3/1/4/131414240/supug_punekilijor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417809/normal_5fda6ac460def.pdfIn PDF document text
    • https://mofafodoler.weebly.com/uploads/1/3/0/8/130874416/105208.pdfIn PDF document text
    • https://cdn.sqhk.co/fexejikexew/eJhctJm/brahma_chicken_colors.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/salosibejodod/reported_cases_of_zika_in_bali_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/free_weight_watchers_recipes.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/agent_vinod_480p_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/gifofitisufirakoze.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_off0000db6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6C 4772 bytes
SHA-256: 8b2611e2f8b9817a7c04d9d183f81560e7acf895e8e1b7bff6dc0bc8c741d96c
font_01_sfnt_off0000eb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8B 10472 bytes
SHA-256: fc28472392f73c8cf1efc24d66843938f0b8f0f90197eaf43882202706fb4171

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