Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a9c80c0aaafeb22…

MALICIOUS

PDF

80.2 KB Created: 2021-09-16 23:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c2ba2f85fdfbadc085fe5334af41cc83 SHA-1: f15ff5b83d18d7a204241b18695b5af88691d7ec SHA-256: 5a9c80c0aaafeb225b227004227e3fd63a2bb2a79f0738ed7e9f46193aec5a88
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://beta-rc.com/upload/files/gekejurexumo.pdf In PDF document text
    • https://portalbime.com/UploadedFiles/New/file/zulesisofujinufanakamuvap.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/kixunupidazipipe.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/86308944946.pdfIn PDF document text
    • https://successalpha.team/upload/files/makek.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/jowudupafowivolaxeg.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/bugixizesifovoromolemulik.pdfIn PDF document text
    • https://rajaunited.com/contents/files/34238885513.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/98229409763.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/95132761955.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf18f17af4---nuzorexogafireguw.pdfIn PDF document text
    • https://terracell.pt/images/file/pofap.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/46405485242.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/60559764264.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/94942269796.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/5024937621.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/wesaxelero.pdfIn PDF document text
    • https://mmszke.hu/files/file/82035604853.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/97235249660.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/60828191424.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/nojazipadis.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/pelopoponoxetuvunukod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=why+is+my+battery+draining+so+fast+androidPDF 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_off0000d2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB00 11004 bytes
SHA-256: 38bffded1e78379d74da6558f0981c9707f904200a12afc0b8ea2124db335853
font_02_sfnt_off0001042f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042F 17792 bytes
SHA-256: 28aad1f453b801b7d64e180d7cc07d59d61f46ff6dd7da7aeec33c101727ddbd

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