Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f6aee12bbf37068…

MALICIOUS

PDF

75.6 KB Created: 2021-09-10 23:25:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7c772691823a0d280aa8ebb60fc67340 SHA-1: f7d9e10ad8edab2a79207071ff7107f8eb540d0d SHA-256: 4f6aee12bbf370688c94366ee8250096efafcc83a4983a5bfc7397b3da2165ea
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to an external URL, which in turn leads to a link farm hosting a large number of other PDF files. This behavior is indicative of a phishing or malware distribution campaign, where the initial PDF serves as a lure to access further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ohadalegistrocbarter.com/ckeditor/uploads/files/19380426491.pdf In PDF document text
    • http://4reality.cz/userfiles/files/67971530452.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/22966978465.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/rozimezezarefifumawuf.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/98802006695.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/xinabovadagav.pdfIn PDF document text
    • https://kapefashion.com/files/files/53443225317.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/rajoraxaxu.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/difowuguvisezob.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/bedonuniforaxipigesakeg.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/vapupevaleguvokaj.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/liporavusiparevimodiret.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/fasezawagofuwakin.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/64135604826.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/sebujatawezabavive.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/79904620225.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/vowevopowa.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/46209574299.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/kisuvazaxelo.pdfIn PDF document text
    • https://ises.smithpressautomation.com/phpsites/vertical_living/uploads/file/jozevoxab.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/80085508371.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/lulvunf7np6b0kvuda6bhtqmm1/dolononokafaxataxan.pdfIn PDF document text
    • http://askaudit.ru/price/87558128634.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/lexuj.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/89913550012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=league+france+1PDF 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_off0000c4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBB 10096 bytes
SHA-256: cd8de952ce7a027ba15cbb0202b52019e8b1829df1dcecdbddf27b1b223b7d55
font_02_sfnt_off0000f35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35E 17408 bytes
SHA-256: 6db8326d70edcd14e764fc349ed29da309b3f02ef0b0860841275318cb59d89c