Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bb361ad2785081d…

MALICIOUS

PDF

85.7 KB Created: 2021-09-12 05:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5bccb1a52ac9e8bd3e46a3752bfd4870 SHA-1: 90daef2ab401293734aa30f6c6d81a79e5160e0e SHA-256: 1bb361ad2785081daa13cebb9b5dfdcfd9c3c72b2898ae1633dec472131ba2f3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to potentially compromised or suspicious domains, suggests a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attack pattern involving the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://khachsan295doson.vn/namthuan/images/news/files/20428182229.pdf In PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ba9906ad3---62746975746.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/bulisakitazel.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/14857444144.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/fopavuvogokuzerajezodego.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/93129684437.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/59278564373.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/xilaverebezo.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/63725680197.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/16798127871.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/78340356930.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/91396291556.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/38873459988.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/96888147862.pdfIn PDF document text
    • https://majubesar.net/contents/files/66942114134.pdfIn PDF document text
    • https://reniuved.it/file/gutixatubodakekobakorek.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/zuvebira.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/32731094862.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/zanafojefubiduwavo.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/fadabinasepifo.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/goradofojuvegutawim.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/16048789700.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/bonazaze.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/moxokugejuvaxutajisibosir.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161337898ca69a---14023170963.pdfIn PDF document text
    • http://mega.kz/media/upload/files/38098936591.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=phone+hard+reset+androidPDF 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_off0000ebae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C0 17620 bytes
SHA-256: 4da3c2583b1fb19729059dedd4ee8d69915331c27ff774e0632b21be41dffdf5
font_02_sfnt_off000131dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131DD 10300 bytes
SHA-256: 314a6a2c90a89720c811e25ae669e084b0f6e459c7a1d7ec2d7464350db82e98