Malicious PDF — malware analysis report

Static analysis result for SHA-256 2be05b063bff1741…

MALICIOUS

PDF

73.8 KB Created: 2021-09-18 21:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7c6cad5c17933995c49dd3a3db7574c8 SHA-1: 060ee44ceb95da9cb51014b606e42726e710416f SHA-256: 2be05b063bff17411a238e5f7094bd18b7080f4d41c39c56502db2cf6ebc0ce0
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links to external PDF files, indicating an attempt to download and execute further malicious content. The heuristic firings, particularly 'PDF_RANDOM_URL_LINK' and 'ML_NYX_PDF_MALICIOUS', along with the ClamAV detection, strongly suggest malicious intent. The document likely serves as a lure to trick users into downloading and opening a malicious second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/38372279536.pdf In PDF document text
    • http://mosjob.ru/images/file/vusirugebezofobidesedezo.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/4talocqc2v71vqp4uu1crlk71d/nuvafurezitagareradetuzu.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/89726871394.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/bomese.pdfIn PDF document text
    • https://onecre.com/images/content/files/69528594678.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/rafibe.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/rinurosalonerukami.pdfIn PDF document text
    • http://snft.ro/media/file/majatasomum.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/bojolopeporexewilevav.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/46909722825.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/34347582464.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/vuzonijivoruf.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/mademenagaxo.pdfIn PDF document text
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/xigurubosemunipukafasenum.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/13200832151.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/55405889843.pdfIn PDF document text
    • http://safarang.com/basefile/files/viliduzavam.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/baluzobefapibedizemikipen.pdfIn PDF document text
    • http://rafaelokazakov.com/file/71988850277.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/viwazajovogate.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/47419336505.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/14250225467.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/jigozuxopototima.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/0ef263d93aa69123aa5cb58a276b3880/koxaxonizomikobajo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=the+start+codon+has+a+dual+function+because+it+also+codes+for+an+amino+acidPDF 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_off0000bdc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDC3 16176 bytes
SHA-256: ae2fe32c4f4b8faaa5cc52f5312b74d89cc060d3a7be0f8e40684bddb98cc6f6
font_01_sfnt_off0000e773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE773 10944 bytes
SHA-256: ceaf4d3342ddca219d0815f617f45a8692892ba2e1a44307ca3f56d0a8188148
font_02_sfnt_off0001009d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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