Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb4211795e8b85f…

MALICIOUS

PDF

68.7 KB Created: 2021-09-30 19:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 608494a81424286752326f31afe10002 SHA-1: e1ed4642aeea556cf79121f82963695918e6d6b6 SHA-256: dcb4211795e8b85f3b9669bb2332c9ed491471e7d7b340ee579687bacb7e3235
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded links pointing to various domains, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a link farm on disposable hosting, likely to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://smidgel.ru/uplcv?utm_term=top+gacha+games+2020 PDF link annotation
    • https://bwawarszawa.pl/upload/file/75249104337.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/meremipefiwavoruti.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/31834352438.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/83041867787.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/18397134767.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/33386997418.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161557e992ec23---11781760352.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/9832128409.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/55736605064.pdfIn PDF document text
    • http://ore-processing.ru/d/files/zupitozunonovelidadamanax.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/33759046639.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/xexuxezik.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/90685999980.pdfIn PDF document text
    • https://hoalavender.net/upload/files/4990127622.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613075d98d81f---pibidijozuratuwo.pdfIn PDF document text
    • http://ihdbd.org/upload/files/riponibixekubijirod.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/ropunik.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/pakutematoxu.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/xawepivisazajokafixe.pdfIn PDF document text
    • https://shibbirs.com/media/files/59890151631.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/27311222268.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/40007654867.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_off0000ad04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC516 15880 bytes
SHA-256: 50ca680e415d9845b228a9cebd47e4d29ac62984ab84ce33118691b57d411a4e
font_02_sfnt_off0000ed77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED77 10588 bytes
SHA-256: 3956036b8d26f08baf4904662cd3d23fcec5d91892825a8b2798a7a82c6d7e2c