Malicious PDF — malware analysis report

Static analysis result for SHA-256 22b57afbe42763f4…

MALICIOUS

PDF

95.8 KB Created: 2021-02-20 02:30:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4c77d293e3f6be0bb21565ef818e77c7 SHA-1: 20b520cdb1049fb6bf3bc3c6aaddf24e314e00d2 SHA-256: 22b57afbe42763f43e3ba44522be6a89d3d2230ef193b1894221c40abf84b42d
192 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure and a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were extracted, the presence of malicious URLs and the heuristic firings suggest the document is designed to redirect users to harmful content.

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=types+of+reactions+worksheet+answers+w+326 In PDF document text
    • http://presalle.xyz/appula_apparao_songs_free4ve8f.pdfIn PDF document text
    • https://cdn.sqhk.co/xefilelo/7egjihY/word_mocha_642.pdfIn PDF document text
    • http://fruktovik.com/batunajefamiferinodwll2.pdfIn PDF document text
    • http://kavanepamor.iblogger.org/56234633333.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446377/normal_5fcc20276606b.pdfIn PDF document text
    • https://cdn.sqhk.co/foroboreb/jed8Qib/photo_video_collage_app_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/bomoxale/gcichfX/handmade_soap_cutting_tools.pdfIn PDF document text
    • http://piredvizhnik.com/66356819324np6xs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424024/normal_5fcd131a74de1.pdfIn PDF document text
    • http://menbp.online/journal_of_immunology_brief_reportsg3an.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407664/normal_5fc7ff8763199.pdfIn PDF document text
    • https://cdn.sqhk.co/zidexamuwela/hciWysp/cinergy_movies_granbury_tx.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/zufaxepixiguxax/84157869808.pdfIn PDF document text
    • http://nufaviziziji.epizy.com/45378484561.pdfIn PDF document text
    • http://jefebewo.epizy.com/20545423225.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/tutorial_photoshop_untuk_pemula_bahasa_indonesia.pdfIn PDF document text
    • http://sunizuz.rf.gd/6357076473.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/ata_hyperthyroidism_guidelines_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/77482653070.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5B 2828 bytes
SHA-256: b7f317aa0f29cd34df008dc84d8f376d2685882a57a4a5cd0d86477d0adf885a
font_01_sfnt_off00013956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13956 5728 bytes
SHA-256: f81d752dc5bd26e933c6b0788ee67535e650084e205fba356a8219a270ca786f
font_02_sfnt_off00014ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CED 10052 bytes
SHA-256: de28fc1490b5ced9bcaa35767b571f56c0b0bac9a5fed469d7e0e9b0177de38a

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