Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cc52b20055a72c9…

MALICIOUS

PDF

86.0 KB Created: 2021-03-17 01:36:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 099eaa37b0637f7c595f336bd0e9b392 SHA-1: d6e871df4b3a80484cfe8d9196813d562bcaea28 SHA-256: 8cc52b20055a72c91d2b9e467f796d3337842df283504969b679c3dc24e10ea6
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious document, likely intended to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • 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://fokemale.ru/award?keyword=fundamentals+of+molecular+virology+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454967/normal_5fe7265a05787.pdfIn PDF document text
    • https://pinosapop.weebly.com/uploads/1/3/4/1/134131344/5432798.pdfIn PDF document text
    • https://juputifewusa.weebly.com/uploads/1/3/4/4/134435955/pizuta-nobivutiwumani.pdfIn PDF document text
    • https://pexaxodosusa.weebly.com/uploads/1/3/0/8/130874045/4617910.pdfIn PDF document text
    • https://jawutasujo.weebly.com/uploads/1/3/0/9/130969833/cfee51671fdb8c.pdfIn PDF document text
    • https://kawuzuke.weebly.com/uploads/1/3/1/6/131606938/suvanoxuxerumiku.pdfIn PDF document text
    • https://setovejuno.weebly.com/uploads/1/3/2/6/132682792/pinaxijivorixiw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445739/normal_5fde46efe4fb1.pdfIn PDF document text
    • https://natatujefeni.weebly.com/uploads/1/3/1/6/131607075/52b70.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403688/normal_5fc71384d9ffd.pdfIn PDF document text
    • https://nemerode.weebly.com/uploads/1/3/0/7/130775229/37e10251bca.pdfIn PDF document text
    • https://minizejemeroro.weebly.com/uploads/1/3/2/7/132740725/6555428.pdfIn PDF document text
    • https://wuwabisa.weebly.com/uploads/1/3/1/6/131606234/6597271.pdfIn PDF document text
    • https://losewilim.weebly.com/uploads/1/3/4/8/134854933/waxutufatokixirovip.pdfIn PDF document text
    • https://febadezupuwile.weebly.com/uploads/1/3/1/0/131071278/7584187.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_69d2028ca98345dfabe241bfd0a9886d.pdf?index=trueIn PDF document text
    • https://1a447ccf-a6a5-490c-ad31-399ae8169532.filesusr.com/ugd/cf5184_e205a02680bf44b79e9f235d1ae0c683.pdf?index=trueIn PDF document text
    • http://gobavaduxa.epizy.com/oracle_12c_download_windows.pdfIn PDF document text
    • https://eb22cd64-ba88-4d74-9269-d2b8937e52af.filesusr.com/ugd/3b217d_0b9d45da4d784423844e4813c1136719.pdf?index=trueIn PDF document text
    • http://xefukogan.rf.gd/71288440109.pdfIn PDF document text
    • https://f45985d3-969e-4a4b-a16b-f92b7c881388.filesusr.com/ugd/20da2d_d9c5a3f6021745cfb5f94f819fb66dd1.pdf?index=trueIn PDF document text
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_a3c44db38b7f4d78898d97eb26c83192.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_off0000f715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF715 7548 bytes
SHA-256: ea5db5e7e4a19b01e2def22ac72a24402a9d56ddacd90f140fda3d80396bbabd
font_01_sfnt_off00011009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11009 5592 bytes
SHA-256: a18f975f6022ea82b51368e5f6768a2a6de6a607b372a71d861d909a3210ebb4
font_02_sfnt_off00012311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12311 10884 bytes
SHA-256: 7350fb368d7ed21806f08356bd4454e67c077a1513590fa5e8b5e74dfd1537fb