Malicious PDF — malware analysis report

Static analysis result for SHA-256 d305a327fa367a30…

MALICIOUS

PDF

86.9 KB Created: 2021-03-21 11:55:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 73c1eff1a8ead9e03b127eb65dd10859 SHA-1: c4611a09bdf4c9cff5ea7b82c04379ebee3ddabd SHA-256: d305a327fa367a3051706f86e2a422c0e190af179ceda2c1e89187592ed712cc
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs, with several heuristics flagging it as a malicious redirector link farm hosted on disposable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, but the presence of multiple links to potentially malicious domains suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://yafferge.ru/123?utm_term=auto+chess+vn In PDF document text
    • http://letinebab.mywebcommunity.org/asperges_me_chant.pdfIn PDF document text
    • https://cdn.sqhk.co/jimevexir/vPjgija/dagivofogejurali.pdfIn PDF document text
    • http://rivilidopu.medianewsonline.com/tojinagava.pdfIn PDF document text
    • https://cdn.sqhk.co/jategumeb/8if6heY/guatemala_crime_and_safety_report_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/gajalalike/e8idggf/afmech_law_ra_10601.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365591/normal_6052e1bc276fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373755/normal_5fe93a464126a.pdfIn PDF document text
    • http://revilokepudidu.mygamesonline.org/jack_reacher_2016_subtitle_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486213/normal_60110ef123e90.pdfIn PDF document text
    • http://mosomupusafebin.medianewsonline.com/virginia_woolf_novel_with_interludes_on_the_beach_crossword_clue.pdfIn PDF document text
    • https://cdn.sqhk.co/xumirikebixo/5RvBJhh/truck_simulator_europe_2_mod_apk_an1.pdfIn PDF document text
    • http://gijaninapumobe.sportsontheweb.net/how_many_questions_are_on_the_traffic_school_test.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452835/normal_5feba85d53ef1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446497/normal_6054e20f8c465.pdfIn PDF document text
    • https://cdn.sqhk.co/moxulofilose/ifsiggg/human_heart_puzzle_template.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/zuwimadaneb/gamafomujotisado.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/jafegi.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/heart_of_darkness_original_text.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/8003946450.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF296 4600 bytes
SHA-256: 237f23a9260b355964cdcb3523527409d6c9110f6a12e52bad14ac4bbca256db
font_01_sfnt_off00010245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10245 24576 bytes
SHA-256: 0921319b7564dd2d91f09e9ce0f22ad144df447a673f57d2c5984016ed396626
font_02_sfnt_off0001381e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1381E 16732 bytes
SHA-256: 4fc67a32cce364447b2ab5b6868ad72ead80fb8838fe5860478324f132a97c87

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