Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f75f2f0220993db…

MALICIOUS

PDF

68.1 KB Created: 2021-09-26 07:38:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 001a50027f43106c864bcc6952809af0 SHA-1: 767cfed9e9f68b259311a2a251f1cdaf8643aa13 SHA-256: 4f75f2f0220993db13bee0e2018a6f3332c42ca5619a66263df910e733f974d4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous embedded URLs suggest the document is designed to redirect users to potentially harmful external sites. No scripts were extracted, but the document's structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://cructi.ru/uplcv?utm_term=is+it+ok+to+lay+a+refrigerator+on+its+back PDF link annotation
    • http://cpspcb.com/uploads/files/11766634973.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/16068482110.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/65382070707.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/negezatulevevigireg.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/didepigapupebejusu.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/2386338899.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/68662192657.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/vasazokafe.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/4633e4e9d96dc297c11a9fd8e5b53e6f/garavinim.pdfIn PDF document text
    • http://paliukenas.lt/i/File/nunopave.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/73772865841.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210909051656144.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/44372503509.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/wexawabexulegasijim.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/54829692817.pdfIn PDF document text
    • https://www.znackakvality.info/files/44159473786.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/99906117307.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_24_02_56_14_9878.pdfIn PDF document text
    • https://granitnet.hu/editor_up/85083246791.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/vulewodatijemubasofe.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/bumekejuvugul.pdfIn PDF document text
    • 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_off0000abe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABE8 10808 bytes
SHA-256: b4d1b3621d9fbd4cd24ef072c6c67318f78dd606a3985ea3931c9e44e49eb36e
font_01_sfnt_off0000c507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC507 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dd19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD19 15128 bytes
SHA-256: d6b74432275ef38d62bce39749d0b00b31d17065156b830a497b4c6e98fcc997

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