Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c5dc5c2da9cee18…

MALICIOUS

PDF

93.8 KB Created: 2021-09-08 16:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fa4b8b99cac38df51a936f54f196d490 SHA-1: af418d894299decb8bb1acbdf1f62601a38e7275 SHA-256: 4c5dc5c2da9cee18a621fe0da516579691912c8ba6ce4f547c07240b22c0da27
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit vulnerabilities or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://kapsalonvogue.nl/files/file/ralulavojora.pdf In PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/33210506652.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/jamokebanefagefineduk.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/jetolokibofema.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/pagisolegakese.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/gerimowaga.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/41503393098.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5a1b56ebc8e02d4e9741edfe9ff028b8/19647046870.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/55181835781.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/kagijadaxuwa.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/34057112474.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/75729395430.pdfIn PDF document text
    • http://salespate.com/userfiles/file/58326450651.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/45783926271.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/19653886718.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/80052163266.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/womefudukukuxu.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/68542694878.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202109060218533530.pdfIn PDF document text
    • http://sakra.sk/storage/file/3401991002.pdfIn PDF document text
    • http://e-district.org/userfiles/file/45099236712.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/36967762122.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/jozasebuwakanuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=omvic+textbook+pdfPDF 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_off00010599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10599 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAB 19916 bytes
SHA-256: cc67e3bc64a794351a3a860882fd1425d4564e932bbea1b92f7990627d76b17a
font_02_sfnt_off0001515b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1515B 10628 bytes
SHA-256: 63aaea4d5ac086b0808206a5bcb303a240471e18de38f0a8028295dc2d87f5fb