Malicious PDF — malware analysis report

Static analysis result for SHA-256 48ac84db66bc93e9…

MALICIOUS

PDF

81.0 KB Created: 2021-09-09 18:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4f08c4f5fb1b076773d75b969eedcb21 SHA-1: 21f517b786b35ae9a290a1ef560bcbf3bc87a13c SHA-256: 48ac84db66bc93e9ca576d715c34fa19029c7770ec7fcf2dc79a8cbad680bcca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external PDF files hosted on various domains. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://brcassociati.com/userfiles/files/60547730483.pdf In PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/nixitaxisovusuz.pdfIn PDF document text
    • https://ms1oke.com/contents/files/19069295347.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/xobaziranorubitiw.pdfIn PDF document text
    • http://swhos.com/upload/files/85793819474.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/saruvonasavavikirudawules.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/taxasikevepujusaz.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/nufetavinasepi.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/fijupimelumuf.pdfIn PDF document text
    • https://network-italia.com/file/98270800551.pdfIn PDF document text
    • http://apismorava.eu/docs/77680030923.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/jubesupuzur.pdfIn PDF document text
    • http://rhondachem.com/d/files/65987711280.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/vulukotujoda.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/46554042720.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/kekobekebolobaze.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132269697ec1---disolo.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/toxuxiwaxidimosesuwimafok.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/bubejomodirix.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/pamiletotitosidena.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/98114655181.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/dulunosezunikapawi.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/63304540300.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/buxebuli.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/69427126656.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/53758459872.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=photo+suit+editor+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_off0000d9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BC 16964 bytes
SHA-256: b42bfb33aafba00b55d03b985710e7a9bf0e1640c05b2278506a1e8450d93c20
font_01_sfnt_off000105e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E0 10504 bytes
SHA-256: c666ced5b1329d35dff1b33feba9752bceaf5d70603b095b3c7dd57419526eb8
font_02_sfnt_off00011df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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