Malicious PDF — malware analysis report

Static analysis result for SHA-256 63d23c4ca41c58c6…

MALICIOUS

PDF

78.7 KB Created: 2021-05-01 23:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9b128bc97b8f1db7c20c868379f55299 SHA-1: 2850b7877e8c484a30a509c185fad2d0caef62c7 SHA-256: 63d23c4ca41c58c619ce45dbf8d0e7f97b5b7671672e1d7eddd416dcb5a6a1e2
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link and a large link farm. The embedded URLs suggest a phishing attempt or SEO spam campaign, aiming to direct users to potentially harmful websites. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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.
  • 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/strik?utm_term=glencoe+geometry+chapter+5+review+answers In PDF document text
    • https://cdn.sqhk.co/zerumowo/ar1jayC/best_dragon_ball_modpack_minecraft.pdfIn PDF document text
    • https://tefegepivovopuf.weebly.com/uploads/1/3/5/3/135311357/88ea0e2d20.pdfIn PDF document text
    • http://papetus.iblogger.org/wuxemokipodifo.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/aigheMh/optical_illusions_art_tutorial.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/CBzRJjj/4831920716.pdfIn PDF document text
    • https://dapekedes.weebly.com/uploads/1/3/4/6/134643928/8368211.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443598/normal_604ba1bb0d17d.pdfIn PDF document text
    • https://wesaxewotivaf.weebly.com/uploads/1/3/4/5/134578523/38cd597.pdfIn PDF document text
    • https://cdn.sqhk.co/jasojime/5nI37Wn/stickers_in_spanish.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379384/normal_5fd6cd4f5524c.pdfIn PDF document text
    • https://vumifedesonuzik.weebly.com/uploads/1/3/4/8/134849268/tajitip.pdfIn PDF document text
    • https://buwotudotep.weebly.com/uploads/1/3/1/6/131606539/755285c953a8c.pdfIn PDF document text
    • https://cdn.sqhk.co/gimatuvuwiw/i8HhjdO/28059397983.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b7f5b04e-b247-49a4-9dc0-39f0c843ec09.filesusr.com/ugd/b56f86_24cf3f2cab58446fb003f5a4ecaec061.pdf?index=trueIn PDF document text
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_1ad42bdfa4ed49f5b3892cf5f6289e44.pdf?index=trueIn PDF document text
    • http://kujojeg.rf.gd/8173428790.pdfIn PDF document text
    • https://e6c529cc-411f-4195-b5ea-7b5fd081490a.filesusr.com/ugd/b7ab08_9a0a1012e25548c48e7dfed61712397c.pdf?index=trueIn PDF document text
    • https://968bac2e-1409-45a7-bd11-2c37eba47390.filesusr.com/ugd/c81504_9814d614f78d4755880d1eca80f9fead.pdf?index=trueIn PDF document text
    • http://pojesonedako.epizy.com/63251240556.pdfIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_7037b4567ff6485f87df5d34fef90361.pdf?index=trueIn PDF document text
    • https://f87ce62f-3d5d-4c42-bff3-2e7d00444551.filesusr.com/ugd/72ed28_668b49524fe24fe787430421592693bd.pdf?index=trueIn PDF document text
    • https://cc0b58a5-7bf4-4b41-9cd7-d9bc0cd2cc6f.filesusr.com/ugd/6dc98b_db2a55f53af5485793d643a22fe25d6c.pdf?index=trueIn PDF document text
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_c1a32063200644d69ca831e2478aecc4.pdf?index=trueIn PDF document text
    • https://d0fd22f1-78bd-4368-960d-2a324028b2bb.filesusr.com/ugd/a4d998_5cbeb7de87c34e678cf46f134bd0dcd4.pdf?index=trueIn 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_off0000deb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB2 4388 bytes
SHA-256: a4a858f078ba3894cbe19be6f8217899a0284c6a402ae2a04039f0a3828ddd29
font_01_sfnt_off0000ee3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3B 5756 bytes
SHA-256: f92a459db74c8ee9a86f932d04407af3a58d7f61d40f9239f99c7b658a4ce882
font_02_sfnt_off000101cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CF 12072 bytes
SHA-256: 893f611575aa339314f8c40c62bb1c713aa5419a54718784aaec5bbfabb446de

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