Malicious PDF — malware analysis report

Static analysis result for SHA-256 acc88960f37fc0c5…

MALICIOUS

PDF

76.9 KB Created: 2021-09-11 13:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2f755912eba1e8bee39fe7f540f22572 SHA-1: c459a54f101b4dfd15967ad1cf3f6ab252cfad8e SHA-256: acc88960f37fc0c5a47043bf5943f52dc4d9af1dc566cfbf0cd327d39c5dcf3d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a large number of links on potentially untrusted hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136790809673---33819699015.pdf In PDF document text
    • http://musicpark-live.com/userfiles/file/57252397089.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/sixuja.pdfIn PDF document text
    • http://wjcopy.com/upload/files/65245873504.pdfIn PDF document text
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/gusawirezasixupovesax.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/15877428552.pdfIn PDF document text
    • http://prompol.com/media/file/36681095824.pdfIn PDF document text
    • https://unaizahic.com/Files/files/sunumelumozalujotegu.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/88664241139.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090819200373499.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/zakelolovafelavexisonoz.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/jemutal.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81953836892.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/bepekubumela.pdfIn PDF document text
    • http://ityab.com/cache/fck_files/file/34646805418.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/91322177816.pdfIn PDF document text
    • http://t-cso.com/upload/file_folder/file/45433251394.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/150925070761318d2c5c301.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/8555077584.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/15386034170.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/95832505658.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=golden+sun+dark+dawn+apkPDF 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_off0000c7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFF 18084 bytes
SHA-256: 44d6f24f4eb232f64501332fbbd514c3bc0cdccd6fb855ee27fafd52fd4e729a
font_02_sfnt_off00010e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E94 10512 bytes
SHA-256: 3d40b6703a77f55730fe43af0d5a8c7f2639f17c148e12aab47fe938e10beaa4

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