Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc64bc1d79fed6d8…

MALICIOUS

PDF

86.3 KB Created: 2021-09-09 12:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 86975fbf3e82893cc17928508728e77b SHA-1: 2de157fa4f4aca670bda107c1611033b830e4b4f SHA-256: cc64bc1d79fed6d8c20b6b28e6290b334073a5da7c35c787b364568a1b7e71b1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. It contains numerous embedded URLs, many pointing to PDF files hosted on various domains, suggesting a phishing or SEO manipulation scheme. The presence of external URIs and the overall structure point towards a spearphishing attachment, likely leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://gianenricofabro.com/userfiles/files/pixexuziviwofesanam.pdf In PDF document text
    • http://bestpokeya.com/uploads/files/zugumitadobavi.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/jinawizakusasopagopivug.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/retafifevibufolo.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/69629324898.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/161378d74200e3---10796647063.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/34617001041.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/raxelorodaga.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/78307550272.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/88747136754.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/76383682492.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/suzipazijipejemojeropov.pdfIn PDF document text
    • http://imaginove.eu/data/Files/64144750918.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/15670484741.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/guxewadeg.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/64204362197.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/83442166931.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/ab670beaab68ee3c1fe8075f283a5170.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/folaxotefigegagefurojixiw.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090803554778.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/bonodozibibe.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/nasavot.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/ravaxirunabadulopegake.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=movie+maker+exe+windows+10PDF 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_off0000eab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB0 17796 bytes
SHA-256: d79969ea98777aa80fee18a8f23cb2ec64cc3ef48fb8a1b743ac87be0dadba1a
font_01_sfnt_off000118f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001310f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1310F 10780 bytes
SHA-256: e58eb364f106fd9240a8a6b3a40b129a0911ff65d95b2953aed834e103bdb815

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