Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c9b9d8a63a9e5fd…

MALICIOUS

PDF

88.7 KB Created: 2021-04-11 01:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9d6d9b5940c7a991f03121bdf1cc6fe2 SHA-1: 237ef0231828efeb858ac1cd0c7c80661ea65be6 SHA-256: 6c9b9d8a63a9e5fd241f0bb827768aa1eb938050ff60f6dea8d9a1099022555e
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 pointing to disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents attempting to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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://gimoguvi.ru/strik?utm_term=entrepreneur+test+questions+and+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4386618/normal_5fe4211627aee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393346/normal_5fd287c0677cc.pdfIn PDF document text
    • http://nicepics.xyz/78288743033i4fok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376870/normal_5fff24b093c36.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425214/normal_5fca04f9aa12c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375073/normal_60330ddac818f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366018/normal_5fee41c376c14.pdfIn PDF document text
    • http://teagreen.space/motofenexudigotot9hi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383302/normal_602499c2e622c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://80b2a579-f9ed-4aa0-b91a-ac3c8973c086.filesusr.com/ugd/353d00_ce7146a4674042f2a958948ec4c0ffb8.pdf?index=trueIn PDF document text
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_ca5f7440df08447ab23fce73db783787.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bcc3a6c-f3ac-4d48-b02d-97c07299d1ae/majidulogavesiluzu.pdfIn PDF document text
    • https://fa5d8e44-005d-4c05-925d-ba60cb7f5023.filesusr.com/ugd/121e37_113a3d81c9e540c09d5231d340087764.pdf?index=trueIn PDF document text
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_83026046161843ef903c7fdb6c9e4a48.pdf?index=trueIn PDF document text
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_fb37682e479e4b6083843d857180ba93.pdf?index=trueIn PDF document text
    • https://eac5c218-d238-408c-98a6-8ff0ecbb25fc.filesusr.com/ugd/b1277d_4abbe607aa664e758572f3de6d9168d8.pdf?index=trueIn PDF document text
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_d00b835763df4d7a9343089f2aa73b16.pdf?index=trueIn PDF document text
    • https://8df9d1b7-8f6e-49e1-bdac-c9da4d4291fd.filesusr.com/ugd/12c198_4167cdd3132847aaa4ba0739b0596695.pdf?index=trueIn PDF document text
    • https://655b5f2c-2f45-4411-b579-7e5bd587bf3d.filesusr.com/ugd/2a272b_4bd997f2889e426c8d5de07346857297.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7cf984c-28c5-4b3e-b735-96cebf64c4e0/bemobotezogibabawa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c73b52b3-d06e-4893-80cb-f75ab8f81557/79581758398.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F0 3440 bytes
SHA-256: 389ca04fe01d6cb0848bc91c01a27abb2a58ee1a2015b51d36d3c75a2e8d9fa1
font_01_sfnt_off00010538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10538 5096 bytes
SHA-256: dd6a89e922015bdce228517325e31950510b661bb803d581876e8991416ab955
font_02_sfnt_off000116aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AA 11396 bytes
SHA-256: 0fdb6bebe205e2ece3a3614457c1cdff02316888fc1ae06d6c6536a0ef1ca78b
font_03_sfnt_off00013df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF3 16480 bytes
SHA-256: cfb81015ccc48e34430eefe4798d2ceb6eb399c3071117bcf8196ad78feeec32

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