Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a4db88ee208116a…

MALICIOUS

PDF

77.8 KB Created: 2021-09-17 16:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3c63204e237168c7b9fd7e31e0a104aa SHA-1: 84d0d17254a9f1504e7b8eb66dc99ecb845385c0 SHA-256: 1a4db88ee208116aab2f54b142511903336a94d81d48586291a1e5b6cc0f1dc4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious content. The presence of numerous external URLs, many pointing to disposable domains, suggests a phishing or link-farming operation. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware delivery or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://nguoiquangphianam.com/uploads/files/vedumabevunofijazideba.pdf In PDF document text
    • http://geosond.pl/userfiles/file/85799420331.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/97533455043.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/vorurasigesuwiwaju.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/setaginelilisoweku.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/fuxilubas.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/gedopapegivirovokudume.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/weduv.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/pawux.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347c1267097---wobazo.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/83772643518.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/makunijijibelujedebilo.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/biwojifijetegani.pdfIn PDF document text
    • http://quranday.org/userfiles/file/22413143414.pdfIn PDF document text
    • http://nessium.net/userfiles/file/10403159665.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/49526461736.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/redajumok.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/85177759678.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/wuvadeladusimuredase.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/pafetaxamul.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/bijinulexulojumuresus.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/medozojevepuruketaposev.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/33659f31f7f4d005b0b70e08a95dc508/96859202967.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=ms+excel+mod+apk+download+for+pcPDF 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_off0000c90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90A 10864 bytes
SHA-256: 2e52cd201330fc1de7e03457d22a8f4a2734011dcf24c783b1faccc9fc5200df
font_01_sfnt_off0000e236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE236 18312 bytes
SHA-256: f9f47163b55dfe9e1554f299b4fac4a4f7ef2e26830015bebb684ed3ae6067e9
font_02_sfnt_off000111ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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