Malicious PDF — malware analysis report

Static analysis result for SHA-256 437cbc8eeea2df05…

MALICIOUS

PDF

72.8 KB Created: 2021-02-27 23:28:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6427ad784ef5e4e06e9a7d966575d97c SHA-1: c9c41b689356a3451697e14bc454687c73ed2349 SHA-256: 437cbc8eeea2df05df40f73c3de02e381505bfee11828d43e9d2fb2f800c528d
206 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, characteristic of a link farm or SEO poisoning attack. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://golowaki.ru/wb?keyword=how%20to%20redeem%20verizon%20code%20pokemon%20go PDF link annotation
    • http://rowowevu.mypressonline.com/do_you_need_a_license_to_do_eyelash_extensions_in_michigan.pdfIn PDF document text
    • https://cdn.sqhk.co/lunosupi/cYQ7Khi/nowetediw.pdfIn PDF document text
    • https://cdn.sqhk.co/sanojuxako/KiePrje/pc_games_download_free_full_version.pdfIn PDF document text
    • http://kvyovk.xyz/how_to_adjust_a_thermostatic_expansion_valve8uidt.pdfIn PDF document text
    • http://kutatit.getenjoyment.net/zitamipi.pdfIn PDF document text
    • https://cdn.sqhk.co/zupivikeg/4ugirie/ai_dungeon_premium_account.pdfIn PDF document text
    • https://cdn.sqhk.co/sebutarukaw/hjaeylE/semidepu.pdfIn PDF document text
    • https://zuseluxutiv.weebly.com/uploads/1/3/4/6/134686448/0471806b1.pdfIn PDF document text
    • http://lofajemami.sportsontheweb.net/who_was_the_prime_minister_of_canada_during_ww1.pdfIn PDF document text
    • http://dvigatel.guru/57169558948slj9m.pdfIn PDF document text
    • http://aydym.club/diana_dill_plastic_surgery88by2.pdfIn PDF document text
    • https://mupasifuv.weebly.com/uploads/1/3/2/6/132680827/8499984.pdfIn PDF document text
    • http://poradoit1.site/alanyaspor_forma_rengiaom09.pdfIn PDF document text
    • https://kunimagim.weebly.com/uploads/1/3/4/6/134608209/pexiwore.pdfIn PDF document text
    • https://linizudozurori.weebly.com/uploads/1/3/4/6/134640128/mojuker.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duvodix.myartsonline.com/clicker_products_klik2_programming_instructions.pdfIn PDF document text
    • http://poburukexefisit.rf.gd/gegunaxojazafuwosep.pdfIn PDF document text
    • http://japinoxizidunub.myartsonline.com/how_to_replace_trimmer_head_echo_srm-210.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_off0000e0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B9 5200 bytes
SHA-256: ede4f7071eafeecefda9bbe8056010b0927402fd35c155b7af83263dbf6b59b0
font_01_sfnt_off0000f27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27C 10564 bytes
SHA-256: f468bca1e4397625a9cb812ea9720bc76e151cece9d0d3e84d0a165783ae730e

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