Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba0619ed6888a3f1…

MALICIOUS

PDF

68.4 KB Created: 2021-09-29 02:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cd374efcef09bf1529d599215535530a SHA-1: 7efa143f713632467f99610dda0763e9218d5dee SHA-256: ba0619ed6888a3f1c4ebf4a3871d8536d6620ca4edae239bd60c438bbf36fb09
134 Risk Score

Malware Insights

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

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features numerous external URIs pointing to disposable hosting, indicative of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=young+storm+xmen PDF link annotation
    • http://afro-safari.com/upload/files/kojuzij.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/nujubefelaga.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/87979325710.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/siwuponikolavulem.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/nalowovopumajokoxipu.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/18830562515.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/9258265743.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/takowedofememarevo.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/muzusipabepetalifuven.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/43342825519.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/96828059404.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/72041217991.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/92101523570.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/virudagikig.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/lebozubuvafi.pdfIn PDF document text
    • http://idroter.org/userfiles/files/45781175304.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210914133848.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/pevufalom.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/sepizajifozipexobagus.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/54497453642.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/defomolalenazatezol.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/fuxagejopanezetiruzifobev.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/31796724308.pdfIn PDF document text
    • 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_off0000af9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF9A 14632 bytes
SHA-256: a08fa88357aac13213e604ab4e35c68887e37a0edc3e9896192117a84cfbda6a
font_01_sfnt_off0000d466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD466 10336 bytes
SHA-256: cdad2fb09f84135e8c04ca51805f96f37be0bcf2ecd4dff1a7f90ce3c99a3ff2
font_02_sfnt_off0000ebce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1