Malicious PDF — malware analysis report

Static analysis result for SHA-256 405b96e34222b8d8…

MALICIOUS

PDF

80.9 KB Created: 2021-09-14 08:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e4a52f429e66597cde36082c0acf2884 SHA-1: 27b81a9a3fe727b91bcdb9dbbe5dbe4c0bd0fae5 SHA-256: 405b96e34222b8d85846545f36a4fff2bbebcd0349dfd0ba63dfe98353d0235f
146 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URIs, many of which are part of a link farm hosted on disposable domains or IP addresses, suggesting a phishing or redirection scheme. The presence of external URIs and a link farm points towards an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://queure.ru/uplcv?utm_term=hairstyle+try+on+apk PDF link annotation
    • http://phuvuongcorp.com/luutru/files/55419901547.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/1f435cd32bbf707d24acb432b49b455b/91480284594.pdfIn PDF document text
    • http://dolonchem.com/upload/files/mamumoroxotitusaperu.pdfIn PDF document text
    • https://rippa.pt/files/file/67615033495.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/31931017921.pdfPDF link annotation
    • http://candemdientu.com/Images_upload/files/wimebowozana.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/vimumak.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/51239737649.pdfIn PDF document text
    • http://jinyezi.cn/upload/28690455322.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/towoxumotuzer.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/46764571849.pdfIn PDF document text
    • http://www.agot.pl/upload/file/91306884458.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/gefofemutepujutoma.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/botufikisuwolutoxudovo.pdfIn PDF document text
    • http://coachhouse.info/assets/file/60145241638.pdfIn PDF document text
    • https://aneri12.cz/res/file/xibubepuvosaremopogetuse.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/43197517807.pdfIn PDF document text
    • http://thongthien.vn/upload/files/fisek.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/54342471748.pdfIn PDF document text
    • http://vladekoservis.ru/files/49600628445.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/xerubivubak.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ejd58d4vrltvas8h39up3ee15g/46932299213.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/41430604684.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_off0000d51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51A 10440 bytes
SHA-256: 6b0faea0ee055fda01b336b6406dd035181a5cdfec4c10822b09577f9074d21c
font_01_sfnt_off0000ece5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE5 18624 bytes
SHA-256: 0ae8d39c7cdf4624f7ea72394afb8ce72efc2acedccd67a341625086282d9c28
font_02_sfnt_off00011dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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