Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0cf80d4f727972d…

MALICIOUS

PDF

95.4 KB Created: 2021-09-14 02:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8a5d5a6801a8acf1a6252bf39c6707f5 SHA-1: aace805b2048adc9f763504455d19e5318475284 SHA-256: f0cf80d4f727972da1f3ce2840dfac709b119edfdb461a2b2efd19dac644cb59
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct domains, with one URL identified as a potential disposable host. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://hnfhdc.com/UpLoadFile/2021090707160684688.pdf In PDF document text
    • https://seerupit.dk/assens/file/94339012319.pdfIn PDF document text
    • https://halkapsikoloji.com/userfiles/file/93494440576.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/mipuxoradavijejovaliwefi.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/85703798194.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/dagifuvajov.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/lefezibaguzoraledovizozi.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/rizenewipidoge.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/27412895292.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/53854483562.pdfIn PDF document text
    • https://unaizahic.com/Files/files/35493872300.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136693fa5347---63207758257.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202108311704271762.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/42084809642.pdfIn PDF document text
    • http://air-con.ru/upload/files/49738280010.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/pupixi.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021090310112359.pdfIn PDF document text
    • https://iphastkala.com/userfiles/file/76863035159.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/nekaletugunozajafekus.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/gaxidogelosugevumifo.pdfIn PDF document text
    • http://om-ar.com/userfiles/file/99603492144.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210908_062902.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=fundamentals+of+electric+circuits+4th+edition+practice+problem+solutions+pdfPDF 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_off00010353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10353 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B65 22476 bytes
SHA-256: 2fc1f3a80620ce7d98ede6b21514f2d085827c075d3d4103709b54e91b9b155a
font_02_sfnt_off00015551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15551 11180 bytes
SHA-256: ced10bea2cb9dddd148bfcc1dda9402a86faf019c5626f0043664917a49826a5

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