Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83bcc26235da9e8…

MALICIOUS

PDF

81.2 KB Created: 2021-03-03 22:33:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c436dbcc13c4621a7f1d836315a886a SHA-1: 77502b42dd6c07b88d8704853d4d85e2e0a20da0 SHA-256: c83bcc26235da9e8af4133cf8d9d2956d78780f53ad46def31caa5ef82907eae
134 Risk Score

Malware Insights

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

The PDF document contains a lure for "Unity crack asset store download free" and embeds multiple external URIs, one of which is a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing or trojan payload. No scripts were extracted, but the embedded URLs and link farm heuristic suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maypoin.ru/123?utm_term=unity+crack+asset+store+download+free
    • https://gizizajavime.weebly.com/uploads/1/3/2/6/132695742/silote-vujodubokiwenum-sebixisetoxux-xexuje.pdf
    • https://cdn.sqhk.co/sujubowip/ihia7ji/othello_game_target.pdf
    • https://cdn.sqhk.co/mimofeto/YjwIijA/package_line_official_account.pdf
    • https://zonapabudaxaj.weebly.com/uploads/1/3/4/0/134017389/junedurovezanomozis.pdf
    • https://cdn.sqhk.co/kubepugemaki/ii90ihB/kidelawejirefakinug.pdf
    • http://leopolds.space/velawumejetaviloxoo13.pdf
    • https://dobisuji.weebly.com/uploads/1/3/1/4/131454523/manatixufibivarizun.pdf
    • https://vefamomapebimid.weebly.com/uploads/1/3/1/4/131406391/xepano.pdf
    • http://tulakijumipad.22web.org/2019_nfl_fantasy_cheat_sheet_printable.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://ripofosefalub.rf.gd/bin_file_converter_to_mp4_android.pdf
    • http://tatefes.rf.gd/speaking_questions_and_answers_for_toefl.pdf
    • http://zejaberija.epizy.com/sinner_in_the_hands_of_an_angry_god_audio.pdf
    • http://xijisunuma.rf.gd/9341783351.pdf
    • http://xosufatobula.rf.gd/google_sheets_compare_two_columns_conditional_formatting.pdf
    • http://fanofajuduma.rf.gd/bluecoat_school_stamford_uniform.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1f3.bin
c8171b8a0873ff202bcf882749ca33db943fbd109e744703a33d58674ebb47e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F3 5264 bytes
font_01_sfnt_off00010402.bin
9a7c6297364014a2186496f21f185d8b00803918c5cdd365177bfa5ce1587a02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10402 3600 bytes
font_02_sfnt_off00011266.bin
1ed999923b271807173b81bca9aef171671f18abe53992b52013fd1c7e001958		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11266 10684 bytes

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