Malicious PDF — malware analysis report

Static analysis result for SHA-256 d43108bfcfbcb642…

MALICIOUS

PDF

78.9 KB Created: 2021-09-17 21:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 54a060ac661ea78f1b0408424595cc13 SHA-1: 07a0424dda5ca876aa30dd8e1356d2f5d64e5e29 SHA-256: d43108bfcfbcb6427af7482f33a774ef09614fc955c999ec6b28fbc972f3e3e0
126 Risk Score

Malware Insights

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

The sample was classified as malicious by ML and ClamAV, and exhibits characteristics of a link farm on disposable hosting. The embedded URLs point to PDFs hosted on various domains, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://jin-hung.com/userfiles/file/5078665693.pdf In PDF document text
    • http://kaitosushisb.com/uploads/files/fabagovevavuv.pdfIn PDF document text
    • http://darstin.com/userfiles/files/wodanobotezivabela.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/65951282134.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/16847338800.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/xatirifij.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/43722947126.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/74874430319.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/bebawawafovina.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/ridelog.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d733bd9ef1---lumofirotopuxejo.pdfIn PDF document text
    • http://cissi.it/userfiles/files/bivazodo.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210905173754090.pdfIn PDF document text
    • http://snkpost.com/fckedit_file/file///20210913_9_51_17.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/ziwuvagibig.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/71679717436.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/20642031809.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/46704478513.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/82573288711.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/6039888094.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/45345088869.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd9152ab76---pipuso.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/zexotinejufosukun.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/divuxezovi.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/86090205730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=deo+screen+recorderPDF 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_off0000d35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35D 17248 bytes
SHA-256: fabb6c8f177519d58a3885bda68396d4d3e8ab69f128d5d65fc88ec192173fb1
font_01_sfnt_off0001003c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003C 9968 bytes
SHA-256: 3aa666ac138ca8f9dbc24c946a7dc9b58a809eade39818a4b8faf4e41b100a30
font_02_sfnt_off00011665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11665 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1