Malicious PDF — malware analysis report

Static analysis result for SHA-256 62c5ccde22463bf8…

MALICIOUS

PDF

75.5 KB Created: 2021-09-16 21:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b4438e030722de37b01d5dec4d20685e SHA-1: 3615cc28b0a8c297de8b0e966946f0a8515494ee SHA-256: 62c5ccde22463bf80e6bfb9a686c71b0e1915dbcd86f10d992fbaca93048fb40
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a high-confidence heuristic identifying one as an algorithmically-generated URL on disposable hosting. This suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to redirect users to compromised or malicious sites. The ML classifier and ClamAV detection further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/54959191809.pdf In PDF document text
    • https://klcconsulting.eu/klc/file/7821586811.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/nalub.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/mulof.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/buxonilifero.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021091400385618.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/mumotipazosolaji.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/84763550738.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/74162632528.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/tesiwegutoxividez.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/68846757999.pdfIn PDF document text
    • http://ledins.lv/cms/file/75500715798.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/52320240071.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/kinutuxedifoluleza.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/28744263478.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/161334c2dc2d28---fexokebelufegototupave.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/87197375528.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/63384425322.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/41940644881.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/12103918473.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133edd99db6e---58116382651.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/pizudezinimaxajekepe.pdfIn PDF document text
    • http://all-premium.com/user_file/files/57659828361.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/15935558127.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=attitude+sad+shayariPDF 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_off0000bbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CB 10268 bytes
SHA-256: 6e1bf6c0b3c9e93b702d109154f23a326f2fb87e418f7a02db40d78fe13c03ac
font_02_sfnt_off0000eb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB13 20500 bytes
SHA-256: 65bca72530ca3c6542d54d2bb7fe584b4fdcb051ce1b491c53c50785e2a78cda