Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea549a073ca471ee…

MALICIOUS

PDF

83.5 KB Created: 2021-09-18 07:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0e2aa5f79e811627bf3780fa3d93f2a0 SHA-1: 043496b59b1845463e5dcfaeeca31c937630cc19 SHA-256: ea549a073ca471ee731fb05b73897a4eeb193145ff2dc4f20c018e261d5c7849
174 Risk Score

Malware Insights

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

The sample is a malicious PDF detected by ClamAV as a phishing trojan. It contains embedded JavaScript and links to algorithmically generated URLs, suggesting it's designed to redirect users to malicious sites. The PDF's structure and heuristic firings indicate it functions as a link farm, likely to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://endobible.com/userfiles/file/52139169784.pdf In PDF document text
    • http://unitec-egypt.net/userfiles/file/piwelukovirusuniruwo.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210918023511360.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/toxevetodipubowokafuraf.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/39803106528.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/30221955729.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/mewituxaxumuxifirefezaji.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/690fktluo7olvrm6vnha1fb6o0/risajobale.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gimobejakogidipobugupe.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/96157454093.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/67048707537.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/42460472960.pdfIn PDF document text
    • http://prograsifkalip.com/files/zipoluluvosakakisu.pdfIn PDF document text
    • http://imoroz.by/upload/file/pojegobetoxu.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/70193740942.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/paris.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/2d1dbf787dbf9604d7e7fa8fe6e0fa55/37933764936.pdfIn PDF document text
    • http://gibisch.info/files/files/25932927230.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/mupavufilu.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/zelifoxijeranatuzagi.pdfIn PDF document text
    • http://www.klccpa.com/userfiles/file/In PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/77266771741.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/94874456171.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/rixofogosifutuvixeniwaj.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/75570507306.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=there+was+a+problem+while+parsing+the+package+meansPDF 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_off0000dfb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB9 11104 bytes
SHA-256: 1533164c6b6bce490dc70ac2bf7a018d5eb9262bf77a8e418577abf68028c9fe
font_01_sfnt_off0000f948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF948 18356 bytes
SHA-256: d05d21168e278bdb69149aa8f58f679b1bfaf15da26235e08d30d006e298cfe9
font_02_sfnt_off00012805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12805 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1