Malicious PDF — malware analysis report

Static analysis result for SHA-256 155ed94f7adc33ed…

MALICIOUS

PDF

80.3 KB Created: 2021-09-18 01:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 56c66428afefb868998870c84c2a381c SHA-1: 4ea9b9ee3e478df16d2966a7445101ffe1b429d4 SHA-256: 155ed94f7adc33edcfbc6e2b33ee10285286a698548ffa537658eff137b4f5d0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous embedded URLs, many of which point to PDF files on disposable or unknown hosting, suggesting a link farm or redirection mechanism. The PDF structure and embedded content indicate it is designed to exploit users by directing them to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://prochem.vn/images/uploads/files/44967140036.pdf In PDF document text
    • https://jnnjhansi.com/userfiles/file/32202036191.pdfIn PDF document text
    • http://www.sunriseacademy.in/ckfinder/userfiles/files/kibofefateredatubirapo.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/36946969537.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/12/19773440083.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/zesokazuxajepovad.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/pizube.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/pakowonesetutukotusali.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210918/file/16319133865211.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/5340325642.pdfIn PDF document text
    • http://renknh.com/ckupload/files/mutokibidajume.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///xaxufefoburene.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/kipudizebowidivuneluxuv.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/79rqbl69q15i6qnqk9rjinc7i8/89392230538.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/21700998894.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/30913166534.pdfIn PDF document text
    • http://i-dron.cz/data/file/jadul.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/junoxogajanemiwanerukani.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/79036221896.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/sijesagisidibogetupi.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/fanofilutotubufokop.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/pupawezajipovabejevufo.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/demorepej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=boron+boulpaep+physiologyPDF 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_off0000d491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA3 17848 bytes
SHA-256: 5c2f3aaf28abdeda77acd901b067780ad4b2ba953ef189fe6cf78fc86b35b072
font_02_sfnt_off00011af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF1 10840 bytes
SHA-256: fcb8b1d0910195f7f81a330aaaa7faf8c2b6517ead918039413cd5abe4ba2cb4