Malicious PDF — malware analysis report

Static analysis result for SHA-256 de57b4ae70e29297…

MALICIOUS

PDF

70.0 KB Created: 2021-09-29 01:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2df00292578d866aa9679211ee91ea7f SHA-1: 376c5ff288efa63109e1ae4e0625f4e91aa2e4b5 SHA-256: de57b4ae70e292977d4a29eb38b2ffe1cec736da9d8e831a0e4a9856e2a806cd
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a specific rule for link farms on disposable hosting, and a critical ClamAV detection for Pdf.Phishing.Trojan. The embedded URLs, despite some being marked benign, contribute to the overall suspicious nature by pointing to numerous distinct hosts. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.badischer-kunstverein.de/ckfinder/userfiles/files/53451378747.pdf In PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/sesidevakeb.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/wudivojovaj.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/borukuvikobejekerawopami.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/mexaxasilarilizuvatori.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/forabategojad.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/469741189.pdfIn PDF document text
    • http://berbun.com/user_img/file/24226428766.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/xejobuxupodemo.pdfIn PDF document text
    • http://inphilong.com/upload/files/pimir.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/mivuxijeroj.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/novuxiwififudomuzilevale.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/jomukoxemajexuri.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-11/20210911225314352819.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/50852304215.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/wubelero.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/zijoridekupijitosapapu.pdfIn PDF document text
    • https://storycycle.com/ckfinder/userfiles/files/rarifofekonuloteni.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///ligodekelokixamu.pdfIn PDF document text
    • http://compsult.net/userfiles/file/lalej.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/59534710594.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/gufunokedugogoxasupigaxo.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/50587846271.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=collective+nouns+for+class+2PDF 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_off0000afaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAA 16864 bytes
SHA-256: db8df57ac56ae588b259e20ff5e7554387f2ecc4175c0a50877fe88858156a63
font_01_sfnt_off0000da2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2A 10644 bytes
SHA-256: 131bf27379a9fc9fedccce2e81af6e63565b539138b4661aa9e2a67d227afe3a
font_02_sfnt_off0000f2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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