Malicious PDF — malware analysis report

Static analysis result for SHA-256 e91774541107fa5b…

MALICIOUS

PDF

78.4 KB Created: 2021-09-17 14:42:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cba832d1c6e9fdde4fa40cec7679be99 SHA-1: f0a774bbc2d280a64f75cecdddcb327048b20571 SHA-256: e91774541107fa5b6327088234f60c06f0bf758e45662e92c7cce0d68fbeda74
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable hosting and using UTM parameters, suggests a phishing or link-farming scheme. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://garglob.ru/uplcv?utm_term=free+online+casino+games+for+android PDF link annotation
    • http://pascalparrot.com/uploads/assets/file/wisilulerapuwivebagara.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/64953998749.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/zebejutinuwamovunazovuka.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413541abaac---koduzuvizipibu.pdfIn PDF document text
    • http://sushibelovo.ru/files/fuxiletafapoko.pdfIn PDF document text
    • https://brukspec.pl/upload/file/79197855181.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/75702781501.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/boguzefuxafopetoduzijep.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/powoxok.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/zamujes.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/80358243410.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/powijadajagaxa.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/78805400406.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/46484254723.pdfIn PDF document text
    • https://msiutilities.net/documents/sawotexotid.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/11724234074.pdfIn PDF document text
    • https://fishuntpesca.it/file/22909065219.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/fafuren.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/88271449338.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/febumodakavuzokuvu.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/59911938043.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/75504135108.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210902_67A094FFD6CA91C3.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://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_off0000d02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02D 10700 bytes
SHA-256: b8a11c1bf68b1cc40c5c7f92d698232179d8bc77842e7d95feea989e5b8ca284
font_01_sfnt_off0000e86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86A 16924 bytes
SHA-256: bfda043a0ecf0fd0741ddec174b8bba95235e5a495c8bee592fdb5e38e53fe4b
font_02_sfnt_off00011430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11430 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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