Malicious PDF — malware analysis report

Static analysis result for SHA-256 15b44ab788f9b377…

MALICIOUS

PDF

82.4 KB Created: 2021-09-08 13:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 35c6efe87658dd7c23372c7504b2c478 SHA-1: 7dbd0968d3c839e5cc9ed2c6f5c986f39b44f420 SHA-256: 15b44ab788f9b377252f55e1fc21407b51fc17c90d8b17ab0a1dbd8dfd43c44e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. The document body, though heavily obfuscated, suggests it is part of a link farm designed to redirect users to various PDF files, likely for phishing or malware distribution. The presence of numerous embedded URLs pointing to external PDF files supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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 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://s-h.cc/uploads/files/202109051924425195.pdf In PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/58899868126.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/75216537298.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109050927301060.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/55703324656.pdfIn PDF document text
    • http://fxmeat.com/upload/file/e7d22a07217ee781d61be5adf039d06a.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/77329724780.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/vexarutitilafuzivi.pdfIn PDF document text
    • https://eniedu.com/data/file/20210904095244.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/2323027506.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/vuzizivefepawabud.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/86206966381.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/kovumibipesu.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/bagobajefepobinebu.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/moxizisipeke.pdfIn PDF document text
    • https://almavilag.hu/files/files/7549712583.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/52738650895.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/19159185728.pdfIn PDF document text
    • http://ombs.ru/uploads/files/27678447249.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/sixebesuvimezipevim.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/38679145291.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/bulujufewesipik.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/fanuvodobig.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/tisufepuxiguzomoxix.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/nonudagananidawifepo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=soda+pdf+premium+crackPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF299 18656 bytes
SHA-256: 801c2f34f6e5f904f8cfb95f51483a17d1432bf78e10ba55ff669d44adb2d539
font_02_sfnt_off00012394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12394 10632 bytes
SHA-256: 6d9f9ecb48420de96df4a58a72d52bc289ce2439567c6a1aee64bde446f89bc1

Open this report in the interactive analyzer, or submit your own file for analysis.