Malicious PDF — malware analysis report

Static analysis result for SHA-256 716c2db37c3bde13…

MALICIOUS

PDF

82.8 KB Created: 2021-02-17 00:42:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4a44fe80032369860de683b5afe1301d SHA-1: 920ca95387a27a50a822b1c9881c666adba50f3c SHA-256: 716c2db37c3bde13b6eaf85975d3ab09722ea4c762aa094bbb65e06087e845b8
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a product manual, likely intended to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/wix?keyword=costway+ice+maker+ep+23703+manual In PDF document text
    • https://static.s123-cdn-static.com/uploads/4490123/normal_5ff8a4af21e78.pdfIn PDF document text
    • https://cdn.sqhk.co/bomikiwolug/genVja3/stuntman_game_ps4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379613/normal_5fdc60657cc90.pdfIn PDF document text
    • https://cdn.sqhk.co/timemowab/hiQDijF/brain_puzzles_fun_games.pdfIn PDF document text
    • http://dabutaxezopis.iblogger.org/jazilexeriwiga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470975/normal_6010626517b76.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420434/normal_5fc5d91bbe8fe.pdfIn PDF document text
    • http://smartcreditcheck.info/475527669966ifyq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486060/normal_602c43b47b0d5.pdfIn PDF document text
    • https://cdn.sqhk.co/timadupak/gh1giib/music_player_app_download_for_pc_7.pdfIn PDF document text
    • http://ebay-coupon.ru/7745249365334kwy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450514/normal_5fd61af7aca7d.pdfIn PDF document text
    • http://kurs1.xyz/xixusabebajajivepepp11gq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384647/normal_5ffabe24edb8d.pdfIn PDF document text
    • http://hdvideo.design/39010591272u2iwh.pdfIn PDF document text
    • https://cdn.sqhk.co/wepunajexiju/jeijhgw/lecture_notes_apk_free_download.pdfIn PDF document text
    • http://daddytestit.xyz/world_beautiful_girl_hd_wallpaper4l5vt.pdfIn PDF document text
    • https://cdn.sqhk.co/sozovifena/Mtgcjd3/ganatexivazagapikixaxako.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dafiwogi.rf.gd/chiang_mai_local_guide.pdfIn PDF document text
    • http://jemekeluvakowop.rf.gd/axis_direct_mobile_app_free.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_off0001059d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059D 5760 bytes
SHA-256: 0d43a6d4168719ee9c89d648a098c9922ee0a49fa0798b664e074ee8c3058692
font_01_sfnt_off00011944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11944 10688 bytes
SHA-256: e47bbd61a8c720f0ecb5172dbf212e7ce9d391b753e9051b048c4cf86c46abe8

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